tread-softly vs Cnidoscolus urens

tread-softly and Cnidoscolus urens both are nouns.

Word	Noun	Adjective	Verb	Adverb
tread-softly	Yes	No	No	No
Cnidoscolus urens	Yes	No	No	No

As nouns, tread-softly and Cnidoscolus urens are synonyms defined as:

Other synonyms of tread-softly include devil nettle, Jatropha stimulosus, Jatropha urens, pica-pica, spurge nettle.

tread-softly (noun)	Cnidoscolus urens (noun)
a stinging herb of tropical America	a stinging herb of tropical America