oo vs ou, What's the Difference?

Which to use

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

#15,961
“oo” frequency rank: #16,509
“ou” frequency rank: 32470
confusion score

Side-by-Side Comparison

Feature	oo	ou
Definition	oh	oder

Letter map: oo vs ou

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

2 ch

Grammar separator: oo vs ou

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: oo is anintj and ouaconjunction. On the page they differ by a single letter - o in “oo” becomes u in “ou”. Our composite confusion score for this pair is 32470, derived from the frequency rank of both members and their visual similarity.

oo is recorded at frequency rank #15,961, classified as anintj, pronounced […]. ou is at rank #16,509, tagged as aconj, pronounced [u].

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 32470, this pair ranks #1,706,890 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of oo vs ou

Shared letters: o. Private to "oo": -. Private to "ou": u.

"oo" · 2 letters · shape VV · "ou" · 2 letters · shape VV

Frequently Asked Questions

Can "oo" and "ou" be used interchangeably?

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

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

"oo" is the more common of the two: it sits at frequency rank #15,961 in our German list, against #16,509 for "ou". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "oo" vs "ou" 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 "ou" - compare definitions side by side with the headword page. Word entry
This pair ranks #1,706,890 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"oo" and "ou" also get mixed up with nearby pairs, the highest-scored neighbour is "OGH vs ou". Nearby pair

Confusion rank #1,706,890 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.