Which to use
“fer” is a noun and “fui” is a verb - they look or sound alike but fill different roles in a sentence.
- #14,849
- “fer” frequency rank
- #852
- “fui” frequency rank
- 15701
- confusion score
Side-by-Side Comparison
| Feature | fer | fui |
|---|---|---|
| Definition | Mutación aspirada del sustantivo colectivo per ('peras') | Primera persona del singular (yo) del pretérito perfecto simple de indicativo de ser. |
Where the eye mixes fer and fui
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Look-alike desk: fer vs fui
These two trip readers on the page rather than in the ear: fer is [ˈf̬eːr] while fui is [ˈfwi]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs verb), which is usually the fastest check. Our composite confusion score for this pair is 15701, derived from the frequency rank of both members and their visual similarity.
fer is recorded at frequency rank #14,849, classified as anoun, pronounced [ˈf̬eːr]. fui is at rank #852, tagged as averb, pronounced [ˈfwi].
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 15701, this pair ranks #279,096 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of fer vs fui
Shared letters: f. Private to "fer": er. Private to "fui": iu.
"fer" · 3 letters · shape CVC · "fui" · 3 letters · shape CVV
Frequently Asked Questions
Can "fer" and "fui" be used interchangeably?
Which is more common, "fer" or "fui"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fer" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fui" - compare definitions side by side with the headword page. Word entry
- This pair ranks #279,096 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "fer" and "fui" also get mixed up with nearby pairs, the highest-scored neighbour is "fer vs fora". Nearby pair
Confusion rank #279,096 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.