ss vs STM, What's the Difference?

Which to use

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

#6,347
“ss” frequency rank: #23,698
“STM” frequency rank: 30045
confusion score

Side-by-Side Comparison

Feature	ss	STM
Definition	Et suivante, et suivantes.	Microscopie à effet tunnel.

Letter map: ss vs STM

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

2 ch

3 ch

STM

Grammar separator: ss vs STM

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ss is anadverb and STManoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 30045, derived from the frequency rank of both members and their visual similarity.

ss is recorded at frequency rank #6,347, classified as anadv, pronounced \et sɥi.vɑ̃\. STM is at rank #23,698, 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 30045, this pair ranks #312,824 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ss vs STM

Shared letters: s. Private to "ss": -. Private to "STM": mt.

"ss" · 2 letters · shape CC · "STM" · 3 letters · shape CCC

Frequently Asked Questions

Can "ss" and "STM" be used interchangeably?

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

Which is more common, "ss" or "STM"?

"ss" is the more common of the two: it sits at frequency rank #6,347 in our French list, against #23,698 for "STM". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

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

Full dictionary entry for "ss" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "STM" - compare definitions side by side with the headword page. Word entry
This pair ranks #312,824 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"ss" and "STM" also get mixed up with nearby pairs, the highest-scored neighbour is "STM vs suu". Nearby pair

Confusion rank #312,824 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.