um vs up, What's the Difference?

Which to use

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

#5,846
“um” frequency rank: #44
“up” frequency rank: 5890
confusion score

Side-by-Side Comparison

Feature	um	up
Definition	Expression of hesitation, uncertainty or space filler in conversation.	Indicating movement towards or location at a higher place or position.

Where the eye mixes um and up

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

2 ch

Why the eye confuses um with up

These two trip readers on the page rather than in the ear: um is /ʌm/ while up is /ʌp/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - m in “um” becomes p in “up”, and the parts of speech differ too (intj vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 5890, derived from the frequency rank of both members and their visual similarity.

um is recorded at frequency rank #5,846, classified as anintj, pronounced /ʌm/. up is at rank #44, tagged as anadv, pronounced /ʌp/.

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 5890, this pair ranks #513,615 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of um vs up

Shared letters: u. Private to "um": m. Private to "up": p.

"um" · 2 letters · shape VC · "up" · 2 letters · shape VC

Frequently Asked Questions

Can "um" and "up" be used interchangeably?

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

In ordinary English text, does "um" or "up" show up more?

"up" is the more common of the two: it sits at frequency rank #44 in our English list, against #5,846 for "um". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Eye-level mix-up between "um" and "up" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "um" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "up" - compare definitions side by side with the headword page. Word entry
This pair ranks #513,615 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"um" and "up" also get mixed up with nearby pairs, the highest-scored neighbour is "UAS vs um". Nearby pair

Confusion rank #513,615 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.