Ranunculus lingua vs bog plant

Ranunculus lingua and bog plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ranunculus lingua	Yes	No	No	No
bog plant	Yes	No	No	No

As nouns, bog plant is a hypernym of Ranunculus lingua; that is, bog plant is a word with a broader meaning than Ranunculus lingua:

Ranunculus lingua: semiaquatic European crowfoot with leaves shaped like spears
bog plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other hypernyms of Ranunculus lingua include marsh plant, swamp plant.

Ranunculus lingua (noun)	bog plant (noun)
semiaquatic European crowfoot with leaves shaped like spears	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath