Poststimulus is valid Scrabble Word

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

Definitions for POSTSTIMULUS in dictionary:

Similar words containing STIMULU without suffix s and without prefix post

stimulus10 tristimulus13 interstimulus15
Find what other words can be done using letters: "poststimulus"
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