Staystitching is valid Scrabble Word

Is staystitching a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List YES
Collins Scrabble Words NO
Is staystitching valid Words with Friends?
Words with Friends YES

Definitions for STAYSTITCHING in dictionary:

Similar words containing STAYSTITCH without suffix ing

staystitch18 staystitched21 staystitches20
Find what other words can be done using letters: "staystitching"
https://scrabble-word.com/finder/staystitching
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