practice game vs exhibition game

practice game and exhibition game both are nouns.

Word	Noun	Adjective	Verb	Adverb
practice game	Yes	No	No	No
exhibition game	Yes	No	No	No

As nouns, practice game and exhibition game are synonyms defined as:

practice game and exhibition game: a game whose outcome is not recorded in the season's standing

practice game (noun)	exhibition game (noun)
a game whose outcome is not recorded in the season's standing	a game whose outcome is not recorded in the season's standing