family Ranunculaceae vs buttercup family

family Ranunculaceae and buttercup family both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Ranunculaceae	Yes	No	No	No
buttercup family	Yes	No	No	No

As nouns, family Ranunculaceae and buttercup family are synonyms defined as:

Other synonyms of family Ranunculaceae include crowfoot family, Ranunculaceae.

family Ranunculaceae (noun)	buttercup family (noun)
a family of Ranunculaceae	a family of Ranunculaceae