swamp rabbit vs cottontail

swamp rabbit and cottontail both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp rabbit	Yes	No	No	No
cottontail	Yes	No	No	No

As nouns, cottontail is a hypernym of swamp rabbit; that is, cottontail is a word with a broader meaning than swamp rabbit:

swamp rabbit: a wood rabbit of southeastern United States swamps and lowlands
cottontail: common small rabbit of North America having greyish or brownish fur and a tail with a white underside; a host for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)

Other hypernyms of swamp rabbit include cottontail rabbit, wood rabbit.

As nouns, cottontail is a hypernym of swamp rabbit; that is, cottontail is a word with a broader meaning than swamp rabbit:

swamp rabbit: a wood rabbit of marshy coastal areas from North Carolina to Florida
cottontail: common small rabbit of North America having greyish or brownish fur and a tail with a white underside; a host for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)

Other hypernyms of swamp rabbit include cottontail rabbit, wood rabbit.

swamp rabbit (noun)	cottontail (noun)
a wood rabbit of southeastern United States swamps and lowlands	common small rabbit of North America having greyish or brownish fur and a tail with a white underside; a host for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)
a wood rabbit of marshy coastal areas from North Carolina to Florida