Is “Grownup” a Scrabble word?
Yes
GROWNUP
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 Grownup
noun
1.An adult (used especially by children).
adjective
1.Of, pertaining to, or suitable for adults.
2.Adult; fully developed; mature.