fax vs foi, What's the Difference?

Which to use

“fax” and “foi” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#12,419
“fax” frequency rank: #42,644
“foi” frequency rank: 55063
confusion score

Side-by-Side Comparison

Feature	fax	foi
Definition	The hair of the head.	A depiction of a handshake.

Letter map: fax vs foi

Shared letters muted; letters that set fax and foi apart highlighted. Shared run: 1.

3 ch

fax

3 ch

foi

Corpus notes: fax and foi

fax and foi are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 55063, derived from the frequency rank of both members and their visual similarity.

fax is recorded at frequency rank #12,419, classified as anoun, pronounced /fæks/. foi is at rank #42,644, tagged as anoun.

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 55063, this pair ranks #136,416 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of fax vs foi

Shared letters: f. Private to "fax": ax. Private to "foi": io.

"fax" · 3 letters · shape CVC · "foi" · 3 letters · shape CVV

Frequently Asked Questions

Can "fax" and "foi" be used interchangeably?

No. They share most of their letters but differ in 2 positions, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Frequency check: "fax" vs "foi" - which ranks higher?

"fax" is the more common of the two: it sits at frequency rank #12,419 in our English list, against #42,644 for "foi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Done with this confusable. These links stay specific to "fax" and "foi".

Full dictionary entry for "fax" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "foi" - compare definitions side by side with the headword page. Word entry
This pair ranks #136,416 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"fax" and "foi" also get mixed up with nearby pairs, the highest-scored neighbour is "foi vs FOMO". Nearby pair

Confusion rank #136,416 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.