um vs umm, What's the Difference?

Which to use

“um” and “umm” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#5,846
“um” frequency rank: #13,629
“umm” frequency rank: 19475
confusion score

Side-by-Side Comparison

Feature	um	umm
Definition	Expression of hesitation, uncertainty or space filler in conversation.	Alternative form of um.

Letter map: um vs umm

Shared letters muted; letters that set um and umm apart highlighted. Shared run: 2.

2 ch

3 ch

umm

Pair insight - um / umm

um and umm are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by 1 extra letter(s) - “um” sits inside “umm”. Our composite confusion score for this pair is 19475, 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/. umm is at rank #13,629, tagged as anintj.

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 19475, this pair ranks #437,918 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of um vs umm

Shared letters: mu. Private to "um": -. Private to "umm": -.

"um" · 2 letters · shape VC · "umm" · 3 letters · shape VCC

Frequently Asked Questions

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

No. They differ by 1 extra letter(s) - “um” sits inside “umm”, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

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

"um" is the more common of the two: it sits at frequency rank #5,846 in our English list, against #13,629 for "umm". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

You've compared "um" and "umm". Here's where to go from here.

Full dictionary entry for "um" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "umm" - compare definitions side by side with the headword page. Word entry
This pair ranks #437,918 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"um" and "umm" also get mixed up with nearby pairs, the highest-scored neighbour is "UAS vs umm". Nearby pair

Confusion rank #437,918 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.