Is “Blabbermouth” a Scrabble word?
Yes
BLABBERMOUTH
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 Blabbermouth
/ˈblæb.ə(ɹ)ˌmaʊθ/
noun
1.A gossip.
“If it weren't for that blabbermouth Sally, the principal would never have known we did it.”
2.A person who talks excessively.
3.A kind of foam-dispensing nozzle used in firefighting at airports.
Synonyms: chatterbox