water buttercup vs Ranunculus aquatilis

water buttercup and Ranunculus aquatilis both are nouns.

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

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

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

Other synonyms of water buttercup include water crowfoot.

water buttercup (noun)	Ranunculus aquatilis (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