Yes, xis is in the scrabble dictionary

...and is worth 10 points by itself.

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Xis Definition

noun

Plural form of xi.
from the English-language Wiktionary

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Top Words by points

Points

six

10

2 letter words with XIS

Points

is

2

si

2

xi

9

3 letter words with XIS

Points

six

10

xis

10

Found 5 words in 0.11426 seconds