Submatrix is valid Scrabble Word

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

Definitions for SUBMATRIX in dictionary:

Words related to SUBMATRIX

submatrices17 submatrixes22

Words that contain SUBMATRIX

submatrixes22
Find what other words can be done using letters: "submatrix"
https://scrabble-word.com/finder/submatrix
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