flagroot vs marsh plant

flagroot and marsh plant both are nouns.

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

As nouns, marsh plant is a hypernym of flagroot; that is, marsh plant is a word with a broader meaning than flagroot:

flagroot: perennial marsh plant having swordlike leaves and aromatic roots
marsh plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other hypernyms of flagroot include bog plant, swamp plant.

flagroot (noun)	marsh plant (noun)
perennial marsh plant having swordlike leaves and aromatic roots	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath