butterflower vs buttercup

butterflower and buttercup both are nouns.

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

As nouns, butterflower and buttercup are synonyms defined as:

butterflower and buttercup: any of various plants of the genus Ranunculus

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

butterflower (noun)	buttercup (noun)
any of various plants of the genus Ranunculus	any of various plants of the genus Ranunculus