swamp rabbit vs marsh hare

swamp rabbit and marsh hare both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp rabbit	Yes	No	No	No
marsh hare	Yes	No	No	No

As nouns, swamp rabbit and marsh hare are synonyms defined as:

swamp rabbit and marsh hare: a wood rabbit of marshy coastal areas from North Carolina to Florida

Other synonyms of swamp rabbit include Sylvilagus palustris.

swamp rabbit (noun)	marsh hare (noun)
a wood rabbit of southeastern United States swamps and lowlands	a wood rabbit of marshy coastal areas from North Carolina to Florida
a wood rabbit of marshy coastal areas from North Carolina to Florida