Is “Tuba” a Scrabble word?
Yes
TUBA
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 Tuba
/ˈtjuː.bə/
noun
1.A large brass musical instrument, usually in the bass range, played through a vibration of the lips upon the mouthpiece and fingering of the keys.
2.A type of Roman military trumpet, distinct from the modern tuba.
3.A large reed stop in organs.
Synonyms: grunt-horn