stinkweed vs penny grass

stinkweed and penny grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
stinkweed	Yes	No	No	No
penny grass	Yes	No	No	No

As nouns, stinkweed and penny grass are synonyms defined as:

stinkweed and penny grass: foetid Eurasian weed having round flat pods; naturalized throughout North America

Other synonyms of stinkweed include fanweed, field pennycress, French weed, mithridate mustard, Thlaspi arvense.

stinkweed (noun)	penny grass (noun)
foetid Eurasian weed having round flat pods; naturalized throughout North America	foetid Eurasian weed having round flat pods; naturalized throughout North America