swamp plant vs marsh plant

swamp plant and marsh plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp plant	Yes	No	No	No
marsh plant	Yes	No	No	No

As nouns, swamp plant and marsh plant are synonyms defined as:

swamp plant and marsh plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other synonyms of swamp plant include bog plant.

swamp plant (noun)	marsh plant (noun)
a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath