tall buttercup vs tall field buttercup

tall buttercup and tall field buttercup both are nouns.

Word	Noun	Adjective	Verb	Adverb
tall buttercup	Yes	No	No	No
tall field buttercup	Yes	No	No	No

As nouns, tall buttercup and tall field buttercup are synonyms defined as:

tall buttercup and tall field buttercup: perennial European buttercup with yellow spring flowers widely naturalized especially in eastern North America

Other synonyms of tall buttercup include meadow buttercup, Ranunculus acris, tall crowfoot.

tall buttercup (noun)	tall field buttercup (noun)
perennial European buttercup with yellow spring flowers widely naturalized especially in eastern North America	perennial European buttercup with yellow spring flowers widely naturalized especially in eastern North America