Yes, dos is in the scrabble dictionary

...and is worth 4 points by itself.

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Dos Definition

noun

Plural form of do.
from the English-language Wiktionary

abbreviation

Disk operating system.
from Free Scrabble Dictionary

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Top Words by points

Points

dos

4

2 letter words with DOS

Points

do

3

od

3

os

2

so

2

3 letter words with DOS

Points

dos

4

ods

4

sod

4

Found 7 words in 0.11623 seconds