key
/kiː/
"key" is a 3-letter English headword indexed on PlainSpell.
The verdict
“key” sits in 20 confusable pairs (corpus #788) as a noun. The look-alike neighbours are the real trap.
- #788
- frequency rank, English
- 1,236
- “K” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An object designed to open and close a lock.
Corpus desk
Index EN-key · key · English
key · rank #788 · 0 variants · 20 confusables
- FREQ-CORE #788
- LEN-MID 3 letters
- VOW-2 2 vowels
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 1,236
- PHOTO-FINISH hey
Nearest frequency peer: hey (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbourhood for “key”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- forward
forward
99,216 corpus weight
- groups
groups
99,215 corpus weight
- hey
hey
99,214 corpus weight
- key
key
99,213 corpus weight
- mom
mom
99,212 corpus weight
- o
o
99,211 corpus weight
What this shows Bars show where “key” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | key |
| Language | English |
| Part of speech | Noun |
| IPA | /kiː/ |
| Letters | 3 |
| Frequency rank | #788 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “key” sits in English frequency
Easy to mix with look-alikes
The spelling risk for key is neighbouring look-alikes ("kI", "ky", …), not just typos; it is anoun pronounced /kiː/. Frequency #788 among 1,236 “K” headwords. 34 recorded senses keep meaning in play.
key has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. It also participates in 20 confusable-pair relationships, "kI", "ky", "ko", and more, where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Middle English keye, kaye, keiȝe, from Old English cǣġ (“key, solution, experiment”) (whence also Scots key and kay (“key”)), from Anglo-Frisian Proto-West Germanic *kaiju, of uncertain origin. The only sure cognates are Saterland Frisian Koai (“key”),… The correct English form is key, spelled K-E-Y.
Definition
- 1An object designed to open and close a lock.
- 2An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain their relative orientation.
- 3A crucial step or requirement.
- 4A small guide explaining symbols or terminology, especially the legend on a map or chart.
- 5A guide to the correct answers of a worksheet or test.
- 6One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.
- 7In musical instruments, one of the valve levers used to select notes, such as a lever opening a hole on a woodwind.
- 8In instruments with a keyboard such as an organ or piano, one of the levers, or especially the exposed front end of it, which are depressed to cause a particular sound or note to be produced.
- 9A scale or group of pitches constituting the basis of a musical composition.
- 10A scale or group of pitches constituting the basis of a musical composition.
- 11A scale or group of pitches constituting the basis of a musical composition.
- 12A scale or group of pitches constituting the basis of a musical composition.
- 13A scale or group of pitches constituting the basis of a musical composition.
- 14The general pitch or tone of a sentence or utterance.
- 15A modification of an advertisement so as to target a particular group or demographic.
- 16An indehiscent, one-seeded fruit furnished with a wing, such as the fruit of the ash and maple; a samara.
- 17A manual electrical switching device primarily used for the transmission of Morse code.
- 18A piece of information (e.g., a password or passphrase) used to encode or decode a message or messages.
- 19A password restricting access to an IRC channel.
- 20In a relational database, a field used as an index into another table (not necessarily unique).
- 21A value that uniquely identifies an entry in a container.
- 22Any of various tools comparable to a wrench (spanner) or driver, or, in some cases, also called a wrench or driver.
- 23A series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.
- 24A piece of wood used as a wedge.
- 25The last board of a floor when laid down.
- 26A keystone.
- 27That part of the plastering which is forced through between the laths and holds the rest in place.
- 28A wooden wedge, driven sideways between a bullhead rail and a cast-iron chair, to keep the rail securely in position.
- 29The degree of roughness, or retention ability of a surface to have applied a liquid such as paint, or glue.
- 30The thirty-third card of the Lenormand deck.
- 31The black ink layer, especially in relation to the three color layers of cyan, magenta, and yellow. See also CMYK.
- 32A color to be masked or made transparent.
- 33The free-throw lane together with the circle surrounding the free-throw line, the free-throw lane having formerly been narrower, giving the area the shape of a skeleton key hole.
- 34A key position player (a tall forward or defender).
Recorded use
Wiktionary examplesThese source excerpts show how key appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
We tiptoed into the house, up the stairs and along the hall into the room where the Professor had been spending so much of his time. 'Twas locked, of course, but the Deacon man got a big bunch of keys out of his pocket and commenced to putter with the lock.
The key to solving this problem is persistence.
Etymology
From Middle English keye, kaye, keiȝe, from Old English cǣġ (“key, solution, experiment”) (whence also Scots key and kay (“key”)), from Anglo-Frisian Proto-West Germanic *kaiju, of uncertain origin. The only sure cognates are Saterland Frisian Koai (“key”), West Frisian kaai (“key”), and North Frisian kai, koie (“key”). Possibly from Proto-Germanic *kēgaz, *kēguz (“stake, post, pole”), from Proto-Indo-European *ǵogʰ-, *ǵegʰ-, *ǵegʰn- (“branch, stake, bush”), which would make it cognate with Middle Low German kāk (“whipping post, pillory”), and perhaps to Middle Dutch keige (“javelin, spear”) and Middle Low German keie, keige (“spear”). For the semantic development, note that medieval keys were simply long poles (ending in a hook) with which a crossbar obstructing a door from the inside could be removed from the outside, by lifting it through a hole in the door. Liberman has noted, however, "The original meaning of *kaig-jo- was presumably '*pin with a twisted end.' Words with the root *kai- followed by a consonant meaning 'crooked, bent; twisted' are common only in the North Germanic languages."
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
How do you spell "key"?
What does "key" mean?
What words are commonly confused with "key"?
How do you pronounce "key"?
What is the origin of the word "key"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "key", not the corpus desk frequency band.
What to do next
You've looked up "key". Here's where to go from here.
- "key" maps to 20 confusable pairs in this vintage; the highest-scored is "kI". View pair
- Usage frequency rank #788 among English headwords in this corpus. Corpus statistics
- Browse more English words in the "K" letter cohort. K–Z browse
- PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day
PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.