sub

/sʌb/

//sʌb// noun

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

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

The verdict

“sub” sits in 20 confusable pairs (corpus #2,236) as a noun. The look-alike neighbours are the real trap.

#2,236
frequency rank, English
6,566
“S” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Abbreviation of submarine.

Corpus desk

Index EN-sub · sub · English

sub · rank #2,236 · 0 variants · 20 confusables

  • FREQ-COMMON #2,236
  • LEN-MID 3 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH studio

Nearest frequency peer: studio (-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 “sub”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “sub” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

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

sub vs SW
0% similar
sub vs SV
0% similar
sub vs Sy
0% similar

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

Key facts for sub
PropertyValue
Headwordsub
LanguageEnglish
Part of speechNoun
IPA/sʌb/
Letters3
Frequency rank#2,236
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “sub” 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). sub lands here:

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

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

Easy to mix with look-alikes

The spelling risk for sub is neighbouring look-alikes ("SW", "SV", …), not just typos; it is anoun pronounced /sʌb/. Frequency #2,236 among 6,566 “S” headwords. 19 recorded senses keep meaning in play.

Zero misspellings are on record for sub in our index, a straightforward case of a spelling with little room for common typos. It also participates in 20 confusable-pair relationships, "SW", "SV", "Sy", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: * Shortened form of any of various words beginning with sub-. The correct English form is sub, spelled S-U-B.

Definition

  1. 1
    Abbreviation of submarine.
  2. 2
    Clipping of submarine sandwich: a sandwich made on a long bun.
  3. 3
    Clipping of submersible.
  4. 4
    Clipping of substitute, often in sports or teaching.
  5. 5
    Clipping of subscription (“a payment made for membership of a club, etc.”).
  6. 6
    Clipping of subtitle
  7. 7
    Clipping of subroutine (sometimes one that does not return a value, as distinguished from a function, which does)
  8. 8
    Clipping of subeditor
  9. 9
    Clipping of subcontractor
  10. 10
    Clipping of subwoofer
  11. 11
    Clipping of submission (of a work for publication).
  12. 12
    Clipping of submissive
  13. 13
    Clipping of subordinate
  14. 14
    Clipping of subaltern
  15. 15
    Clipping of subscription (or (by extension) a subscriber) to an online channel or feed.
  16. 16
    Clipping of subsistence money, part of a worker's wages paid before the work is finished.
  17. 17
    Clipping of subreddit.
  18. 18
    Clipping of subject (“particular area of study”)
  19. 19
    Clipping of subliminal (“an audio or video recording intended to produce physical or psychological changes in the listener”)

Recorded use

Wiktionary examples

These source excerpts show how sub appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. You know, we got Russian subs creepin' around; anythin' goes wrong they can say whatever they want happened! Give their folks medals!
  2. We can get subs at that deli.

Etymology

* Shortened form of any of various words beginning with sub-.

This word in other languages

submarino(Español)U-Boot(Deutsch)

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 "sub"?
"sub" is spelled S-U-B. The IPA pronunciation is /sʌb/.
What does "sub" mean?
As a noun, "sub" means: Abbreviation of submarine.
What words are commonly confused with "sub"?
"sub" is commonly confused with "SW", "SV", "Sy". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "sub"?
The IPA (International Phonetic Alphabet) transcription for "sub" is /sʌb/. 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 "sub"?
* Shortened form of any of various words beginning with sub-. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "sub", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

3rd#2,239max#2,222leg#2,215fox#2,204

What to do next

You've looked up "sub". Here's where to go from here.

  • "sub" maps to 20 confusable pairs in this vintage; the highest-scored is "SW". View pair
  • Usage frequency rank #2,236 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "S" letter cohort. S–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.

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

Source: FrequencyWords open word-frequency list