fin

/fɪn/

//fɪn// noun

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

"fin" is a 3-letter English headword indexed on PlainSpell.

The verdict

“fin” is a moderately-common English word, ranked #11,210 in English word frequency and used as a noun.

#11,210
frequency rank, English
3
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.

Visual similarity to commonly confused words

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

fin vs FL
0% similar
fin vs FM
0% similar
fin vs fu
33% similar

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

Key facts for fin
PropertyValue
Headwordfin
LanguageEnglish
Part of speechNoun
IPA/fɪn/
Letters3
Frequency rank#11,210
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “fin” 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). fin 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 fin is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /fɪn/. Corpus data places it at rank #11,210 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 11 distinct senses for this headword, so context determines which meaning a reader should apply.

fin doesn't appear in our generated misspelling index, which points to an orthography that plays by predictable English rules. It also participates in 20 confusable-pair relationships, "FL", "FM", "fu", 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 Middle English fin, from Old English finn, from Proto-Germanic *finnō, *finǭ (“dorsal fin”) (compare Dutch vin, German Finne, Swedish finne, fena), from Proto-Indo-European *(s)pīn- (“backbone, dorsal fin”) (compare Old Irish ind (“end, point”), Latin … The correct English form is fin, spelled F-I-N.

Definition

  1. 1
    One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
  2. 2
    A similar appendage of a cetacean or other marine animal.
  3. 3
    A thin, rigid component of an aircraft, extending from the fuselage and used to stabilise and steer the aircraft.
  4. 4
    A similar structure protruding from a projectile, used to help keep it on course.
  5. 5
    A similar structure on the bottom of a surfboard, used to help steer it.
  6. 6
    A hairstyle, resembling the fin of a fish, in which the hair is combed and set into a vertical ridge along the top of the head from about the crown to the forehead.
  7. 7
    A device worn by divers and swimmers on their feet.
  8. 8
    An extending part on a surface of a radiator, engine, heatsink, etc., used to facilitate cooling.
  9. 9
    A sharp raised edge (generally in concrete) capable of damaging a roof membrane or vapor retarder.
  10. 10
    The conning tower of a submarine.
  11. 11
    A person's hand.

Etymology

From Middle English fin, from Old English finn, from Proto-Germanic *finnō, *finǭ (“dorsal fin”) (compare Dutch vin, German Finne, Swedish finne, fena), from Proto-Indo-European *(s)pīn- (“backbone, dorsal fin”) (compare Old Irish ind (“end, point”), Latin pinna (“feather, wing, fin”), Tocharian A spin (“hook”).

Synonyms

flippervaneMohicanflipper

This word in other languages

aleta(Español)nageoire(Français)Flosse(Deutsch)barbatana(Português)

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 "fin"?
"fin" is spelled F-I-N. The IPA pronunciation is /fɪn/.
What does "fin" mean?
As a noun, "fin" means: One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
What words are commonly confused with "fin"?
"fin" is commonly confused with "FL", "FM", "fu". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "fin"?
The IPA (International Phonetic Alphabet) transcription for "fin" is /fɪn/. 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 "fin"?
From Middle English fin, from Old English finn, from Proto-Germanic *finnō, *finǭ (“dorsal fin”) (compare Dutch vin, German Finne, Swedish finne, fena), from Proto-Indo-European *(s)pīn- (“backbone, dorsal fin”) (compare Old Irish ind (“end, point... 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 “fin”

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

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