STM vs su, What's the Difference?

Which to use

“STM” is a noun and “su” is a verb - they look or sound alike but fill different roles in a sentence.

#23,698
“STM” frequency rank: #1,609
“su” frequency rank: 25307
confusion score

Side-by-Side Comparison

Feature	STM	su
Definition	Microscopie à effet tunnel.	Participe passé masculin singulier du verbe savoir.

Letter map: STM vs su

Shared letters muted; letters that set STM and su apart highlighted. Shared run: 1.

3 ch

STM

2 ch

Role in the sentence - STM and su

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: STM is anoun and suaverb. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 25307, derived from the frequency rank of both members and their visual similarity.

STM is recorded at frequency rank #23,698, classified as anoun. 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 25307, this pair ranks #341,604 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of STM vs su

Shared letters: s. Private to "STM": mt. Private to "su": u.

"STM" · 3 letters · shape CCC · "su" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "STM" for "su" ever safe?

No - they are not even the same part of speech. "STM" is a noun and "su" a verb, so a sentence built for one is usually ungrammatical with the other.

In ordinary French text, does "STM" or "su" show up more?

"su" is the more common of the two: it sits at frequency rank #1,609 in our French list, against #23,698 for "STM". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

You've compared "STM" and "su". Here's where to go from here.

Full dictionary entry for "STM" 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 #341,604 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"STM" and "su" also get mixed up with nearby pairs, the highest-scored neighbour is "STM vs suu". Nearby pair

Confusion rank #341,604 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.