water dragon vs kingcup

water dragon and kingcup both are nouns.

Word	Noun	Adjective	Verb	Adverb
water dragon	Yes	No	No	No
kingcup	Yes	No	No	No

As nouns, water dragon and kingcup are synonyms defined as:

water dragon and kingcup: swamp plant of Europe and North America having bright yellow flowers resembling buttercups

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

water dragon (noun)	kingcup (noun)
swamp plant of Europe and North America having bright yellow flowers resembling buttercups	any of various plants of the genus Ranunculus
North American herbaceous perennial of wet places having slender curled racemes of small white flowers	swamp plant of Europe and North America having bright yellow flowers resembling buttercups