Instress is valid Scrabble Word

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

Definitions for INSTRESS in dictionary:

Words related to INSTRESS

instressed11 instresses10 instressing12
Find what other words can be done using letters: "instress"
https://scrabble-word.com/finder/instress
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