Ob vs op, What's the Difference?

Which to use

“Ob” is a name and “op” is a preposition - they look or sound alike but fill different roles in a sentence.

#31,155
“Ob” frequency rank: #2,889
“op” frequency rank: 34044
confusion score

Side-by-Side Comparison

Feature	Ob	op
Definition	Fleuve de Sibérie, qui se jette dans l’océan Arctique.	Sur.

Letter map: Ob vs op

Shared letters muted; letters that set Ob and op apart highlighted. Shared run: 1.

2 ch

Part-of-speech tell for Ob / op

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Ob is aname and opapreposition. On the page they differ by a single letter - b in “Ob” becomes p in “op”. Our composite confusion score for this pair is 34044, derived from the frequency rank of both members and their visual similarity.

Ob is recorded at frequency rank #31,155, classified as aname. op is at rank #2,889, tagged as aprep, pronounced \ɔp\.

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 34044, this pair ranks #286,552 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Ob vs op

Shared letters: o. Private to "Ob": b. Private to "op": p.

"Ob" · 2 letters · shape VC · "op" · 2 letters · shape VC

Frequently Asked Questions

Do "Ob" and "op" mean the same thing in a sentence?

No - they are not even the same part of speech. "Ob" is a name and "op" a preposition, so a sentence built for one is usually ungrammatical with the other.

In ordinary French text, does "Ob" or "op" show up more?

"op" is the more common of the two: it sits at frequency rank #2,889 in our French list, against #31,155 for "Ob". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Pair "Ob" vs "op" is on the table, pick a follow-up below.

Full dictionary entry for "Ob" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "op" - compare definitions side by side with the headword page. Word entry
This pair ranks #286,552 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"Ob" and "op" also get mixed up with nearby pairs, the highest-scored neighbour is "Ob vs och". Nearby pair

Confusion rank #286,552 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.