Slack is valid Scrabble Word

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

Definitions for SLACK in dictionary:

Words related to SLACK

slacked14 slacker13 slackest14 slacking15 slackly16 slackness15 slacks12 slake9

How to use SLACK in a sentence

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