Scrabble Dictionary

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Yes, onomatopoeia is playable

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Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Onomatopoeia" Definition

noun

The formation or use of words such as buzz or murmur that imitate the sounds associated with the objects or actions they refer to.
The naming of a thing or action by a vocal of the sound associated with it (as ).
The use of words whose sound suggests the sense.