Slackest is valid Scrabble Word

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

Definitions for SLACKEST in dictionary:

Words related to SLACKEST

slack11 slacker13

How to use SLACKEST in a sentence

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