Runflat is valid Scrabble Word

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

Definitions for RUNFLAT in dictionary:

Words related to RUNFLAT

runflats11

Words that contain RUNFLAT

runflats11
Find what other words can be done using letters: "runflat"
https://scrabble-word.com/finder/runflat
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