SSR vs STS, What's the Difference?

Which to use

“SSR” and “STS” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#49,370
“SSR” frequency rank: #40,514
“STS” frequency rank: 89884
confusion score

Side-by-Side Comparison

Feature	SSR	STS
Definition	Sexe sans risque, safe sex.	Navette spatiale américaine ayant effectué 135 vols pour l'agence spatiale américaine (NASA) entre le 12 avril 1981 et juillet 2011.

Where the eye mixes SSR and STS

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. SSR and STS follow the identical consonant-vowel pattern (CCC). Same shape at a glance is often the real trap, independent of shared letters.

3 ch

SSR

3 ch

STS

Why the eye confuses SSR with STS

A purely visual mix-up. SSR (\ɛs.ɛs.ɛʁ\) and STS (\ɛs te ɛs\) 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 89884, derived from the frequency rank of both members and their visual similarity.

SSR is recorded at frequency rank #49,370, classified as anoun, pronounced \ɛs.ɛs.ɛʁ\. STS is at rank #40,514, tagged as anoun, pronounced \ɛs te ɛs\.

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 89884, this pair ranks #5,337 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of SSR vs STS

Shared letters: s. Private to "SSR": r. Private to "STS": t.

"SSR" · 3 letters · shape CCC · "STS" · 3 letters · shape CCC

Frequently Asked Questions

Do "SSR" and "STS" mean the same thing in a sentence?

No. They are said differently (\ɛs.ɛs.ɛʁ\ versus \ɛs te ɛs\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "SSR" or "STS"?

"STS" is the more common of the two: it sits at frequency rank #40,514 in our French list, against #49,370 for "SSR". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "SSR" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "STS" - compare definitions side by side with the headword page. Word entry
This pair ranks #5,337 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"SSR" and "STS" also get mixed up with nearby pairs, the highest-scored neighbour is "SSR vs suu". Nearby pair

Confusion rank #5,337 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.