Yes, yup is in the scrabble dictionary

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Yup Definition

noun

A yes; an affirmative answer.
from the English-language Wiktionary

adverb

Informal Yes.
from The American Heritage Dictionary of the English Language, 4th Edition

preposition

Yes.
from the English-language Wiktionary

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Top Words by points

Points

yup

8

2 letter words with YUP

Points

up

4

3 letter words with YUP

Points

yup

8

Found 2 words in 0.10434 seconds