fax vs fun, What's the Difference?

Which to use

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

#12,419
“fax” frequency rank: #502
“fun” frequency rank: 12921
confusion score

Side-by-Side Comparison

Feature	fax	fun
Definition	The hair of the head.	Amusement, enjoyment or pleasure.

Where the eye mixes fax and fun

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

3 ch

fax

3 ch

fun

Visual trap between fax and fun

A purely visual mix-up. fax (/fæks/) and fun (/fʌn/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 12921, 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/. fun is at rank #502, tagged as anoun, pronounced /fʌn/.

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 12921, this pair ranks #478,781 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of fax vs fun

Shared letters: f. Private to "fax": ax. Private to "fun": nu.

"fax" · 3 letters · shape CVC · "fun" · 3 letters · shape CVC

Frequently Asked Questions

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

No. They are said differently (/fæks/ versus /fʌn/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

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

"fun" is the more common of the two: it sits at frequency rank #502 in our English list, against #12,419 for "fax". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "fax" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "fun" - compare definitions side by side with the headword page. Word entry
This pair ranks #478,781 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"fax" and "fun" also get mixed up with nearby pairs, the highest-scored neighbour is "fax vs foh". Nearby pair

Confusion rank #478,781 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.