Superheavyweights is valid word

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

Definitions for SUPERHEAVYWEIGHTS in dictionary:

Similar words containing HEAVYWEIGHT without suffix s and without prefix super

heavyweight27 heavyweights28 superheavyweight34
Find what other words can be done using letters: "superheavyweights"
https://scrabble-word.com/finder/superheavyweights
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