mansion vs manse

mansion and manse both are nouns.

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

As nouns, mansion and manse are synonyms defined as:

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

mansion (noun)	manse (noun)
a large and imposing house	the residence of a clergyman (especially a Presbyterian clergyman)
(astrology) one of 12 equal areas into which the zodiac is divided	a large and imposing house