mansion vs mcmansion

mansion and mcmansion both are nouns.

Word	Noun	Adjective	Verb	Adverb
mansion	Yes	No	No	No
mcmansion	Yes	No	No	No

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

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

mansion (noun)	mcmansion (noun)
a large and imposing house	a generic, mass-produced luxury home
(astrology) one of 12 equal areas into which the zodiac is divided