oa vs oi, What's the Difference?

Which to use

“oa” is a noun and “oi” is a phrase - they look or sound alike but fill different roles in a sentence.

#31,199
“oa” frequency rank: #26,990
“oi” frequency rank: 58189
confusion score

Side-by-Side Comparison

Feature	oa	oi
Definition	Genitiv Singular des Substantivs uba	ein Grußwort mit unverbindlichem Charakter

Letter map: oa vs oi

Shared letters muted; letters that set oa and oi apart highlighted. Shared run: 1.

2 ch

Grammar separator: oa vs oi

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: oa is anoun and oiaphrase. On the page they differ by a single letter - a in “oa” becomes i in “oi”. Our composite confusion score for this pair is 58189, derived from the frequency rank of both members and their visual similarity.

oa is recorded at frequency rank #31,199, classified as anoun, pronounced […]. oi is at rank #26,990, tagged as aphrase, pronounced [oj].

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 58189, this pair ranks #872,345 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of oa vs oi

Shared letters: o. Private to "oa": a. Private to "oi": i.

"oa" · 2 letters · shape VV · "oi" · 2 letters · shape VV

Frequently Asked Questions

Do "oa" and "oi" mean the same thing in a sentence?

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

Frequency check: "oa" vs "oi" - which ranks higher?

"oi" is the more common of the two: it sits at frequency rank #26,990 in our German list, against #31,199 for "oa". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "oa" vs "oi" is on the table, pick a follow-up below.

Full dictionary entry for "oa" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "oi" - compare definitions side by side with the headword page. Word entry
This pair ranks #872,345 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"oa" and "oi" also get mixed up with nearby pairs, the highest-scored neighbour is "oa vs puzzles". Nearby pair

Confusion rank #872,345 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.