mansion vs manor house

mansion and manor house both are nouns.

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

As nouns, manor house is a hyponym of mansion; that is, manor house is a word with a more specific, narrower meaning than mansion:

Other hyponyms of mansion include manor, castle, palace, stately home, mcmansion.

mansion (noun)	manor house (noun)
a large and imposing house	the mansion of a lord or wealthy person
(astrology) one of 12 equal areas into which the zodiac is divided