Yes, umm is in the scrabble dictionary

...and is worth 10 points by itself.

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Umm Definition

interjection

Interjection implying hesitation.
from the English-language Wiktionary

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Top Words by points

Points

mum

7

2 letter words with UMM

Points

mm

6

mu

4

um

4

3 letter words with UMM

Points

mum

7

umm

7

Found 5 words in 0.10533 seconds