twin

/twɪn/

//twɪn// noun

By · According to Wiktionary data (CC BY-SA) ·

"twin" is a 4-letter English headword indexed on PlainSpell.

The verdict

“twin” is a regularly-used English word, ranked #4,054 in English word frequency and used as a noun.

#4,054
frequency rank, English
4
letters
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

twin vs two
50% similar
twin vs twp
50% similar
twin vs twos
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for twin
PropertyValue
Headwordtwin
LanguageEnglish
Part of speechNoun
IPA/twɪn/
Letters4
Frequency rank#4,054
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “twin” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). twin lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for twin is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /twɪn/. Corpus data places it at rank #4,054 in overall English word frequency, indicating it appears regularly in written and spoken text. 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 twin, with forms such as "tiwn", "ttwin", and "twinn". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 20 confusable-pair relationships, "two", "twp", "twos", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: PIE word *dwóh₁ From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinjaz, *twinahz (“two each”), from Proto-Indo-European *dwino-… The correct English form is twin, spelled T-W-I-N.

Definition

  1. 1
    Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
  2. 2
    Either of two similar or closely related objects, entities etc.
  3. 3
    A room in a hotel, guesthouse, etc. with two beds; a twin room.
  4. 4
    A two-engine aircraft.
  5. 5
    A twin crystal.
  6. 6
    A twin size mattress; or a bed designed for such a mattress.
  7. 7
    A friendly term of address, typically for men.

Etymology

PIE word *dwóh₁ From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinjaz, *twinahz (“two each”), from Proto-Indo-European *dwino- (“twin”), from *dwóh₁ (“two”). Cognate with Scots twyn (“twin”), Dutch tweeling (“twin”), German Zwilling (“twin”), Danish tvilling (“twin”), Swedish tvilling (“twin”), Faroese tvinnur (“a double set”), Icelandic tvenna (“duo, pair”), Lithuanian dvynys (“twin”), Russian двойня (dvojnja, “twin”).

This word in other languages

gemelo(Español)jumeau(Français)Zwilling(Deutsch)gémeo(Português)

Common misspellings

Also misspelled as: tiwn,ttwin,twinn,twni,twwin,wtin

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of twin - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

tiwn2ttwin1twinn1twni2twwin1wtin2
Edit distance from "twin"

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

How do you spell "twin"?
"twin" is spelled T-W-I-N. The IPA pronunciation is /twɪn/.
What does "twin" mean?
As a noun, "twin" means: Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
What words are commonly confused with "twin"?
"twin" is commonly confused with "two", "twp", "twos". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "twin"?
The IPA (International Phonetic Alphabet) transcription for "twin" is /twɪn/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "twin"?
PIE word *dwóh₁ From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinjaz, *twinahz (“two each”), from Proto-Indo-Europe... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “twin”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is T-W-I-N - every other letter order is a misspelling in standard orthography.
  • Say it as /twɪn/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “two” - see the side-by-side comparison. twin vs two
  • 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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list