Caltha palustris vs cowslip

Caltha palustris and cowslip both are nouns.

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

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

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

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

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