mansion vs hall

mansion and hall both are nouns.

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

As nouns, mansion and hall are synonyms defined as:

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

mansion (noun)	hall (noun)
a large and imposing house	a large building for meetings or entertainment
(astrology) one of 12 equal areas into which the zodiac is divided	a large room for gatherings, receiving guests, or entertainment
	an interior passage or corridor onto which rooms open
	a college or university building containing living quarters for students
	a large entrance or reception room or area
	the large room of a manor or castle
	a large and imposing house
	a large building used by a college or university for teaching or research