FidovsfitWhich spelling fits?

Quick tell: Fido is a name, fit is an adjective, so they fill different roles in a sentence.

Which to use

“Fido” is a name and “fit” is an adjective - they look or sound alike but fill different roles in a sentence.

#44,781
“Fido” frequency rank
#1,185
“fit” frequency rank
45966
confusion score

Side-by-Side Comparison

Feature Fido fit
Definition A stereotypical given name for a dog. Suitable; proper

Where the eye mixes Fido and fit

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
Fido
3 ch
fit

Look-alike desk: Fido vs fit

These two trip readers on the page rather than in the ear: Fido is /ˈfaɪ.dəʊ/ while fit is /fɪt/. 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 (name vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 45966, derived from the frequency rank of both members and their visual similarity.

Fido is recorded at frequency rank #44,781, classified as aname, pronounced /ˈfaɪ.dəʊ/. fit is at rank #1,185, tagged as anadj, pronounced /fɪt/.

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 45966, this pair ranks #216,266 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Fido vs fit

Shared letters: fi. Private to "Fido": do. Private to "fit": t.

"Fido" · 4 letters · shape CVCV  ·  "fit" · 3 letters · shape CVC

Known mistypes of this pair

  • Fidofdio · ffido · fiddo · fiod · ifdo

Frequently Asked Questions

Is swapping "Fido" for "fit" ever safe?
No - they are not even the same part of speech. "Fido" is a name and "fit" an adjective, so a sentence built for one is usually ungrammatical with the other.
In ordinary English text, does "Fido" or "fit" show up more?
"fit" is the more common of the two: it sits at frequency rank #1,185 in our English list, against #44,781 for "Fido". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "Fido" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "fit" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #216,266 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "Fido" and "fit" also get mixed up with nearby pairs, the highest-scored neighbour is "Fido vs FOMO". 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 #216,266 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list