frat house vs chapterhouse

frat house and chapterhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
frat house	Yes	No	No	No
chapterhouse	Yes	No	No	No

As nouns, frat house and chapterhouse are synonyms defined as:

frat house and chapterhouse: a house used as a residence by a chapter of a fraternity

Other synonyms of frat house include fraternity house.

frat house (noun)	chapterhouse (noun)
a house used as a residence by a chapter of a fraternity	a house used as a residence by a chapter of a fraternity
	a building attached to a monastery or cathedral; used as a meeting place for the chapter