kingcup vs bog plant

kingcup and bog plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
kingcup	Yes	No	No	No
bog plant	Yes	No	No	No

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

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

Other hypernyms of kingcup include marsh plant, swamp plant.

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