uh vs um, What's the Difference?

Which to use

“uh” is an intj and “um” is an article - they look or sound alike but fill different roles in a sentence.

#14,258
“uh” frequency rank: #12
“um” frequency rank: 14270
confusion score

Side-by-Side Comparison

Feature	uh	um
Definition	expressa que algo não tem aprovação, é desaprovado, é reprovado, está desagradando	qualquer

Letter map: uh vs um

Shared letters muted; letters that set uh and um apart highlighted. Shared run: 1.

2 ch

Role in the sentence - uh and um

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: uh is anintj and umanarticle. On the page they differ by a single letter - h in “uh” becomes m in “um”. Our composite confusion score for this pair is 14270, derived from the frequency rank of both members and their visual similarity.

uh is recorded at frequency rank #14,258, classified as anintj. um is at rank #12, tagged as anarticle, pronounced /ũw/.

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 14270, this pair ranks #57,880 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of uh vs um

Shared letters: u. Private to "uh": h. Private to "um": m.

"uh" · 2 letters · shape VC · "um" · 2 letters · shape VC

Frequently Asked Questions

Do "uh" and "um" mean the same thing in a sentence?

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

Which is more common, "uh" or "um"?

"um" is the more common of the two: it sits at frequency rank #12 in our Portuguese list, against #14,258 for "uh". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Done with this confusable. These links stay specific to "uh" and "um".

Full dictionary entry for "uh" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "um" - compare definitions side by side with the headword page. Word entry
This pair ranks #57,880 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"uh" and "um" also get mixed up with nearby pairs, the highest-scored neighbour is "ú vs uh". Nearby pair

Confusion rank #57,880 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.