OCC vs occur, What's the Difference?

Which to use

“OCC” is a name and “occur” is a verb - they look or sound alike but fill different roles in a sentence.

#43,291
“OCC” frequency rank: #3,187
“occur” frequency rank: 46478
confusion score

Side-by-Side Comparison

Feature	OCC	occur
Definition	Initialism of Office of the Comptroller of the Currency.	To happen or take place.

Where the spellings diverge

Shared letters are muted; the letters that actually set OCC and occur apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

3 ch

OCC

5 ch

occur

Spelling & Dictionary Insight

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: OCC is aname and occuraverb. On the page they differ by 2 extra letter(s) - “OCC” sits inside “occur”. Our composite confusion score for this pair is 46478, derived from the frequency rank of both members and their visual similarity.

OCC is recorded at frequency rank #43,291, classified as aname. occur is at rank #3,187, tagged as averb, pronounced /əˈkɜː/.

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 46478, this pair ranks #211,374 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of OCC vs occur

Shared letters: co. Private to "OCC": -. Private to "occur": ru.

"OCC" · 3 letters · shape VCC · "occur" · 5 letters · shape VCCVC

Known mistypes of this pair

occur ← cocur · occru · occurr · ocucr · ocur

Frequency comparison

OCC#43,291

occur#3,187

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "OCC" and "occur" be used interchangeably?

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

Which is more common, "OCC" or "occur"?

"occur" is the more common of the two: it sits at frequency rank #3,187 in our English list, against #43,291 for "OCC". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering OCC vs occur

The fastest way to pick the right one every time.

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