ob vs Opi, What's the Difference?

Which to use

“ob” is a conjunction and “Opi” is a noun - they look or sound alike but fill different roles in a sentence.

#139
“ob” frequency rank: #44,834
“Opi” frequency rank: 44973
confusion score

Side-by-Side Comparison

Feature	ob	Opi
Definition	leitet indirekte Fragesätze sowie Ungewissheit, Zweifel oder dergleichen ausdrückende Nebensätze ein (in Form von Subjekt-, Objekt- und Attributsätzen)	Kosewort für Opa

Where the spellings diverge

Shared letters are muted; the letters that actually set ob and Opi apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.

2 ch

3 ch

Opi

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: ob is [ɔp] while Opi is [ˈoːpi]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (conjunction vs noun), which is usually the fastest check. Our composite confusion score for this pair is 44973, derived from the frequency rank of both members and their visual similarity.

ob is recorded at frequency rank #139, classified as aconj, pronounced [ɔp]. Opi is at rank #44,834, tagged as anoun, pronounced [ˈoːpi].

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 44973, this pair ranks #1,368,622 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ob vs Opi

Shared letters: o. Private to "ob": b. Private to "Opi": ip.

"ob" · 2 letters · shape VC · "Opi" · 3 letters · shape VCV

Frequency comparison

ob#139

Opi#44,834

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "ob" and "Opi" be used interchangeably?

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

Which is more common, "ob" or "Opi"?

"ob" is the more common of the two: it sits at frequency rank #139 in our German list, against #44,834 for "Opi". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering ob vs Opi

The fastest way to pick the right one every time.

Check the role first: if you need a conjunction, it's “ob”; for a noun, it's “Opi”.
See each word in full, definition, IPA, etymology and its other confusables. Full “ob” entry
Browse more pairs most likely to be confused. Most confusable