flex
/flɛks/
"flex" is a 4-letter English headword indexed on PlainSpell.
The verdict
“flex” is a moderately-common English word, ranked #10,696 in English word frequency and used as a noun.
- #10,696
- frequency rank, English
- 4
- letters
- 6
- tracked misspellings
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Flexibility, pliancy.
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 | flex |
| Language | English |
| Part of speech | Noun |
| IPA | /flɛks/ |
| Letters | 4 |
| Frequency rank | #10,696 |
| Misspellings tracked | 6 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “flex” sits in English frequency
Spelling & Dictionary Insight
The English entry for flex is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /flɛks/. Corpus data places it at rank #10,696 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 7 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 6 likely wrong-spelling variants for flex, with forms such as "felx", "fflex", and "flexx". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 20 confusable-pair relationships, "fly", "fox", "flu", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: From Latin flexus, past participle of flecto (“to bend”). The correct English form is flex, spelled F-L-E-X.
Definition
- 1Flexibility, pliancy.
- 2An act of flexing.
- 3Any flexible insulated electrical wiring.
- 4A flexible insulated electrical cord.
- 5Flexible ductwork, typically flexible plastic over a metal wire coil to shape a tube.
- 6A point of inflection.
- 7An act or instance of flaunting something; a boast or brag; something considered impressive.
Etymology
From Latin flexus, past participle of flecto (“to bend”).
This word in other languages
Common misspellings
Also misspelled as: felx,fflex,flexx,fllex,flxe,lfex
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of flex - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
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.
Frequently Asked Questions
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Using “flex”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-L-E-X - every other letter order is a misspelling in standard orthography.
- Say it as /flɛks/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “fly” - see the side-by-side comparison. flex vs fly
- Browse more English words and confusable pairs in the same reference. English words
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.