residence vs mansion

residence and mansion both are nouns.

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

As nouns, residence and mansion are synonyms defined as:

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

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