oo vs Os, What's the Difference?

Which to use

“oo” is an intj and “Os” is a noun - they look or sound alike but fill different roles in a sentence.

#15,961
“oo” frequency rank: #6,701
“Os” frequency rank: 22662
confusion score

Side-by-Side Comparison

Feature	oo	Os
Definition	oh	wallförmige Sedimentation von Schotter und Sand unterhalb oder in Spalten von Gletschern

Letter map: oo vs Os

Shared letters muted; letters that set oo and Os apart highlighted. Shared run: 1.

2 ch

Role in the sentence - oo and Os

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: oo is anintj and Osanoun. On the page they differ by a single letter - o in “oo” becomes s in “Os”. Our composite confusion score for this pair is 22662, derived from the frequency rank of both members and their visual similarity.

oo is recorded at frequency rank #15,961, classified as anintj, pronounced […]. Os is at rank #6,701, tagged as anoun, pronounced [oːs].

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 22662, this pair ranks #1,871,347 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of oo vs Os

Shared letters: o. Private to "oo": -. Private to "Os": s.

"oo" · 2 letters · shape VV · "Os" · 2 letters · shape VC

Frequently Asked Questions

Is swapping "oo" for "Os" ever safe?

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

Which is more common, "oo" or "Os"?

"Os" is the more common of the two: it sits at frequency rank #6,701 in our German list, against #15,961 for "oo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pair "oo" vs "Os" is on the table, pick a follow-up below.

Full dictionary entry for "oo" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Os" - compare definitions side by side with the headword page. Word entry
This pair ranks #1,871,347 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"oo" and "Os" also get mixed up with nearby pairs, the highest-scored neighbour is "oo vs puzzles". Nearby pair

Confusion rank #1,871,347 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.