Hmm vs. Umm

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Difference Between Hmm and Umm
Hmminterjection
Indicating thinking or pondering.
Hmm... that's an interesting idea.Hmm... I just can't decide between the two.Umminterjection
Interjection implying hesitation; see um.
- How does a plane fly?- Umm, I don't know.Hmminterjection
A demand for an answer to a question.
Just where were you until 2 a.m.? Hmm?Ummverb
To make the umm sound to express confusion or hesitancy.
Hmmverb
(intransitive) To make a thoughtful humming noise.
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