kingcup vs butterflower

kingcup and butterflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
kingcup	Yes	No	No	No
butterflower	Yes	No	No	No

As nouns, kingcup and butterflower are synonyms defined as:

Other synonyms of kingcup include butter-flower, buttercup, crowfoot, goldcup.

kingcup (noun)	butterflower (noun)
any of various plants of the genus Ranunculus	any of various plants of the genus Ranunculus
swamp plant of Europe and North America having bright yellow flowers resembling buttercups