fraternity house vs chapterhouse

fraternity house and chapterhouse both are nouns.

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

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

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

Other synonyms of fraternity house include frat house.

fraternity 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