One who speaks or understands many languages
A
Scholar
B
Grammarian
C
Linguist
D
Polyglot
Correct Answer: Polyglot
One word substitute is Polyglot.Scholar: a specialist in a particular branch of study, especially the humanities.
Grammarian: a person who studies and writes about grammar.
Linguist: a person skilled in foreign languages.
Polyglot: knowing or using several languages.