mansion vs residence

mansion and residence both are nouns.

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

As nouns, mansion and residence are synonyms defined as:

Other synonyms of mansion include hall, manse, mansion house.

mansion (noun)	residence (noun)
a large and imposing house	the act of dwelling in a place
(astrology) one of 12 equal areas into which the zodiac is divided	the official house or establishment of an important person (as a sovereign or president)
	a large and imposing house
	any address at which you dwell more than temporarily