Which to use
“SF” is an adjective and “su” is a verb - they look or sound alike but fill different roles in a sentence.
- #15,503
- “SF” frequency rank
- #1,609
- “su” frequency rank
- 17112
- confusion score
Side-by-Side Comparison
| Feature | SF | su |
|---|---|---|
| Definition | De science-fiction, relatif à la science-fiction. | Participe passé masculin singulier du verbe savoir. |
Letter map: SF vs su
Shared letters muted; letters that set SF and su apart highlighted. Shared run: 1.
Grammar separator: SF vs su
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: SF is anadjective and suaverb. On the page they differ by a single letter - f in “SF” becomes u in “su”. Our composite confusion score for this pair is 17112, derived from the frequency rank of both members and their visual similarity.
SF is recorded at frequency rank #15,503, classified as anadj. su is at rank #1,609, tagged as averb, pronounced \sy\.
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 17112, this pair ranks #384,740 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of SF vs su
Shared letters: s. Private to "SF": f. Private to "su": u.
"SF" · 2 letters · shape CC · "su" · 2 letters · shape CV
Frequently Asked Questions
Is swapping "SF" for "su" ever safe?
In ordinary French text, does "SF" or "su" show up more?
Useful next steps
You've compared "SF" and "su". Here's where to go from here.
- Full dictionary entry for "SF" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "su" - compare definitions side by side with the headword page. Word entry
- This pair ranks #384,740 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "SF" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "SF vs suu". Nearby pair
Confusion rank #384,740 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.