creeping buttercup vs kingcup

creeping buttercup and kingcup both are nouns.

Word	Noun	Adjective	Verb	Adverb
creeping buttercup	Yes	No	No	No
kingcup	Yes	No	No	No

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

Other hypernyms of creeping buttercup include butter-flower, buttercup, butterflower, crowfoot, goldcup.

creeping buttercup (noun)	kingcup (noun)
perennial European herb with long creeping stolons	any of various plants of the genus Ranunculus
	swamp plant of Europe and North America having bright yellow flowers resembling buttercups