cowslip vs Caltha palustris

cowslip and Caltha palustris both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowslip	Yes	No	No	No
Caltha palustris	Yes	No	No	No

As nouns, cowslip and Caltha palustris are synonyms defined as:

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

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

cowslip (noun)	Caltha palustris (noun)
early spring flower common in British isles having fragrant yellow or sometimes purple flowers	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