Monopoly vs board game

Monopoly and board game both are nouns.

Word	Noun	Adjective	Verb	Adverb
Monopoly	Yes	No	No	No
board game	Yes	No	No	No

As nouns, board game is a hypernym of Monopoly; that is, board game is a word with a broader meaning than Monopoly:

Monopoly: a board game in which players try to gain a monopoly on real estate as pieces advance around the board according to the throw of a die
board game: a game played on a specially designed board

Monopoly (noun)	board game (noun)
a board game in which players try to gain a monopoly on real estate as pieces advance around the board according to the throw of a die	a game played on a specially designed board