meadow bright vs swamp plant

meadow bright and swamp plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
meadow bright	Yes	No	No	No
swamp plant	Yes	No	No	No

As nouns, swamp plant is a hypernym of meadow bright; that is, swamp plant is a word with a broader meaning than meadow bright:

meadow bright: swamp plant of Europe and North America having bright yellow flowers resembling buttercups
swamp plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other hypernyms of meadow bright include bog plant, marsh plant.

meadow bright (noun)	swamp plant (noun)
swamp plant of Europe and North America having bright yellow flowers resembling buttercups	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath