Taoiseach is valid word

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

Definitions for TAOISEACH in dictionary:

Words that contain TAOISEACH

taoiseachs15
Find what other words can be done using letters: "taoiseach"
https://scrabble-word.com/finder/taoiseach
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