Ranunculus aquatilis vs water buttercup

Ranunculus aquatilis and water buttercup both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ranunculus aquatilis	Yes	No	No	No
water buttercup	Yes	No	No	No

As nouns, Ranunculus aquatilis and water buttercup are synonyms defined as:

Ranunculus aquatilis and water buttercup: plant of ponds and slow streams having submerged and floating leaves and white flowers; Europe and North America

Other synonyms of Ranunculus aquatilis include water crowfoot.

Ranunculus aquatilis (noun)	water buttercup (noun)
plant of ponds and slow streams having submerged and floating leaves and white flowers; Europe and North America	plant of ponds and slow streams having submerged and floating leaves and white flowers; Europe and North America