Rost is valid Scrabble Word

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

Definitions for ROST in dictionary:

Words related to ROST

roast5 rosted7 rosting8 rosts5

How to use ROST in a sentence

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