chapterhouse vs fraternity house

chapterhouse and fraternity house both are nouns.

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

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

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

Other synonyms of chapterhouse include frat house.

chapterhouse (noun)	fraternity house (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