Yes, roar is playable
...and is worth 4 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Roar" Definition
noun
A loud burst of laughter.
A loud deep prolonged sound or cry, as of a person in distress or rage.
A loud prolonged noise, such as that produced by waves.
The loud deep cry of a wild animal.
The deep cry of a wild animal (as a lion).
phrasal-verb
Roar back To have great success after a period of lackluster performance; make a dramatic recovery: lost the first set but roared back to win the match.
verb-intransitive
To be disorderly or rowdy.
To breathe with a rasping sound. Used of a horse.
To laugh loudly or excitedly.
To make or produce a loud noise or din: The engines roared.
To utter a loud, deep, prolonged sound, especially in distress, rage, or excitement.
verb-transitive
To put, bring, or force into a specified state by roaring: The crowd roared itself hoarse.
To utter or express with a loud, deep, and prolonged sound. See Synonyms at shout.
verb
To utter or emit a full loud prolonged sound.
To sing or shout with full force.
To make or emit a loud confused sound (as background reverberation or rumbling).
To be boisterous or disorderly.
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