marsh marigold vs Caltha palustris

marsh marigold and Caltha palustris both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh marigold	Yes	No	No	No
Caltha palustris	Yes	No	No	No

As nouns, marsh marigold and Caltha palustris are synonyms defined as:

marsh marigold and Caltha palustris: swamp plant of Europe and North America having bright yellow flowers resembling buttercups

Other synonyms of marsh marigold include cowslip, kingcup, May blob, meadow bright, water dragon.

marsh marigold (noun)	Caltha palustris (noun)
swamp plant of Europe and North America having bright yellow flowers resembling buttercups	swamp plant of Europe and North America having bright yellow flowers resembling buttercups