Yes, lum is in the scrabble dictionary

...and is worth 8 points by itself.

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Lum Definition

noun

A chimney.
from the English-language Wiktionary
A chimney.
from Free Scrabble Dictionary

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Here are some other words you could make with the letters LUM, you can also
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Top Words by points

Points

lum

5

2 letter words with LUM

Points

mu

4

um

4

3 letter words with LUM

Points

lum

5

Found 3 words in 0.12395 seconds