manor house vs mansion house

manor house and mansion house both are nouns.

Word	Noun	Adjective	Verb	Adverb
manor house	Yes	No	No	No
mansion house	Yes	No	No	No

As nouns, mansion house is a hypernym of manor house; that is, mansion house is a word with a broader meaning than manor house:

Other hypernyms of manor house include hall, manse, mansion, residence.

manor house (noun)	mansion house (noun)
the mansion of a lord or wealthy person	a large and imposing house