Subspontaneous is valid Scrabble Word

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

Definitions for SUBSPONTANEOUS in dictionary:

Similar words containing SPONTANEOU without suffix s and without prefix sub

spontaneous13 spontaneously18 spontaneousness17 spontaneousnesses19
Find what other words can be done using letters: "subspontaneous"
https://scrabble-word.com/finder/subspontaneous
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