Is “Terra” a Scrabble word?
Yes
TERRA
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 Terra
/ˈtɛɹə/
noun
1.(astrogeology) A rough upland or mountainous region of the Moon with a relatively high albedo.