Ultraluminous is valid Scrabble Word

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

Definitions for ULTRALUMINOUS in dictionary:

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