Sis is valid Scrabble Word

Is sis a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is sis valid Words with Friends?
Words with Friends YES

Definitions for SIS in dictionary:

Words related to SIS

si2 sises5 sisses6 sister6

How to use SIS in a sentence

Find what other words can be done using letters: "sis"
https://scrabble-word.com/finder/sis
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