Is “Inkhorn” a Scrabble word?
Yes
INKHORN
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 Inkhorn
/ˈɪŋkˌhɔː(ɹ)n/
noun
1.A small portable container, often made of horn, used to carry ink.
2.(used attributively, of vocabulary) Pedantic, obscurely scholarly.