richweed vs Pilea pumilla

richweed and Pilea pumilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
richweed	Yes	No	No	No
Pilea pumilla	Yes	No	No	No

As nouns, richweed and Pilea pumilla are synonyms defined as:

richweed and Pilea pumilla: a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves

Other synonyms of richweed include clearweed, dead nettle.

richweed (noun)	Pilea pumilla (noun)
a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves	a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves
erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States