Topscoring is valid Scrabble Word

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

Definitions for TOPSCORING in dictionary:

Words related to TOPSCORING

topscore12

Similar words containing TOPSCOR without suffix ing

topscore12 topscored14 topscores13
Find what other words can be done using letters: "topscoring"
https://scrabble-word.com/finder/topscoring
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