Which to use
“fast” is an adjective and “fut” is an intj - they look or sound alike but fill different roles in a sentence.
- #767
- “fast” frequency rank
- #44,798
- “fut” frequency rank
- 45565
- confusion score
Side-by-Side Comparison
| Feature | fast | fut |
|---|---|---|
| Definition | Firmly or securely fixed in place; stable. | Alternative form of 'sfoot. |
Letter map: fast vs fut
Shared letters muted; letters that set fast and fut apart highlighted. Shared run: 2.
Role in the sentence - fast and fut
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: fast is anadjective and futanintj. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 45565, derived from the frequency rank of both members and their visual similarity.
fast is recorded at frequency rank #767, classified as anadj, pronounced /fɑːst/. fut is at rank #44,798, tagged as anintj.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 45565, this pair ranks #220,063 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fast vs fut
Shared letters: ft. Private to "fast": as. Private to "fut": u.
"fast" · 4 letters · shape CVCC · "fut" · 3 letters · shape CVC
Known mistypes of this pair
- fast ← afst · fasst · fastt · ffast · fsat
Frequently Asked Questions
Can "fast" and "fut" be used interchangeably?
In ordinary English text, does "fast" or "fut" show up more?
Useful next steps
Pair "fast" vs "fut" is on the table, pick a follow-up below.
- Full dictionary entry for "fast" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fut" - compare definitions side by side with the headword page. Word entry
- This pair ranks #220,063 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fast" and "fut" also get mixed up with nearby pairs, the highest-scored neighbour is "foh vs fut". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #220,063 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.