water dragon vs lizard's-tail

water dragon and lizard's-tail both are nouns.

Word	Noun	Adjective	Verb	Adverb
water dragon	Yes	No	No	No
lizard's-tail	Yes	No	No	No

As nouns, water dragon and lizard's-tail are synonyms defined as:

water dragon and lizard's-tail: North American herbaceous perennial of wet places having slender curled racemes of small white flowers

Other synonyms of water dragon include Saururus cernuus, swamp lily.

water dragon (noun)	lizard's-tail (noun)
swamp plant of Europe and North America having bright yellow flowers resembling buttercups	North American herbaceous perennial of wet places having slender curled racemes of small white flowers
North American herbaceous perennial of wet places having slender curled racemes of small white flowers