Which to use
“ab” is a noun and “af” is a preposition - they look or sound alike but fill different roles in a sentence.
- #9,951
- “ab” frequency rank
- #14,405
- “af” frequency rank
- 24356
- confusion score
Side-by-Side Comparison
| Feature | ab | af |
|---|---|---|
| Definition | ou (académique) Onzième mois du calendrier hébreu. | De. Note d’usage : la préposition est suivie du datif. |
Same sound, different letters: ab vs af
Muted letters are shared; highlighted letters are the only spelling cue when pronunciation matches. Shared run: 1 letter.
Same sound, different spelling - ab / af
Say them out loud and nothing separates them: ab and af carry the same recorded pronunciation, \av\. Grammar is what tells them apart: one is anoun, the other apreposition, so most sentences will only accept one of them. They differ by a single letter - b in “ab” becomes f in “af”. Our composite confusion score for this pair is 24356, derived from the frequency rank of both members and their visual similarity.
ab is recorded at frequency rank #9,951, classified as anoun, pronounced \av\. af is at rank #14,405, tagged as aprep, pronounced \aːv\.
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 24356, this pair ranks #347,061 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of ab vs af
Shared letters: a. Private to "ab": b. Private to "af": f.
"ab" · 2 letters · shape VC · "af" · 2 letters · shape VC
Frequently Asked Questions
Is swapping "ab" for "af" ever safe?
Which is more common, "ab" or "af"?
After this comparison
"ab" and "af" share a sound, keep the gloss open, then jump to the headword or a nearby trap.
- Full dictionary entry for "ab" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "af" - compare definitions side by side with the headword page. Word entry
- This pair ranks #347,061 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "ab" and "af" also get mixed up with nearby pairs, the highest-scored neighbour is "af vs aur". Nearby pair
Confusion rank #347,061 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.