Is “Thumbtack” a Scrabble word?
Yes
THUMBTACK
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 Thumbtack
/ˈθʌm.tæk/
noun
1.A small nail-like tack with a slightly rounded head that can be pressed into place with light pressure from the thumb; used for hanging light articles on a wall or noticeboard.
Synonyms: drawing pin, pushpin
verb
1.To fix or attach something with a thumbtack.