Yes, un is in the scrabble dictionary

...and is worth 4 points by itself.

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Un Definition

noun

One.
from the English-language Wiktionary

article

A, an (masculine oblique singular indefinite article).
from the English-language Wiktionary

unknown

One.
from the English-language Wiktionary

abbreviation

United Nations.
from Free Scrabble Dictionary

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Top Words by points

Points

nu

2

2 letter words with UN

Points

nu

2

un

2

Found 2 words in 0.09663 seconds