Macs is valid Scrabble Word

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

Definitions for MACS in dictionary:

Words related to MACS

mac7
Find what other words can be done using letters: "macs"
https://scrabble-word.com/finder/macs
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