Is “Homonym” a Scrabble word?
Yes
HOMONYM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Homonym
/ˈhɒm.əˌnɪm/
noun
1.(strict sense) A word that both sounds and is spelled the same as another word.
2.A word that sounds or is spelled the same as another word, technically called a homophone (same sound) or a homograph (same spelling).
3.A name for a taxon that is identical in spelling to another name that belongs to a different taxon.