mithridate mustard vs penny grass

mithridate mustard and penny grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
mithridate mustard	Yes	No	No	No
penny grass	Yes	No	No	No

As nouns, mithridate mustard and penny grass are synonyms defined as:

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

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

mithridate mustard (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