fitvsfoWhich spelling fits?

Quick tell: fit is a verb, fo is an intj, so they fill different roles in a sentence.

Which to use

“fit” is a verb and “fo” is an intj - they look or sound alike but fill different roles in a sentence.

#19,734
“fit” frequency rank
#20,044
“fo” frequency rank
39778
confusion score

Side-by-Side Comparison

Feature fit fo
Definition Tercera persona del singular (il, elle, on) del pretérito perfecto simple de indicativo de faire. Expresión usada al percibir mal olor o sabor.

Where the eye mixes fit and fo

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
fit
2 ch
fo

Visual trap between fit and fo

These two trip readers on the page rather than in the ear: fit is [fi] while fo is [ˈfo]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (verb vs intj), which is usually the fastest check. Our composite confusion score for this pair is 39778, derived from the frequency rank of both members and their visual similarity.

fit is recorded at frequency rank #19,734, classified as averb, pronounced [fi]. fo is at rank #20,044, tagged as anintj, pronounced [ˈfo].

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 39778, this pair ranks #162,676 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of fit vs fo

Shared letters: f. Private to "fit": it. Private to "fo": o.

"fit" · 3 letters · shape CVC  ·  "fo" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "fit" for "fo" ever safe?
No - they are not even the same part of speech. "fit" is a verb and "fo" an intj, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "fit" or "fo"?
"fit" is the more common of the two: it sits at frequency rank #19,734 in our Spanish list, against #20,044 for "fo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Eye-level mix-up between "fit" and "fo" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "fit" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "fo" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #162,676 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "fit" and "fo" also get mixed up with nearby pairs, the highest-scored neighbour is "fo vs fora". Nearby pair

Confusion rank #162,676 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list