Thlaspi arvense vs penny grass

Thlaspi arvense and penny grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thlaspi arvense	Yes	No	No	No
penny grass	Yes	No	No	No

As nouns, Thlaspi arvense and penny grass are synonyms defined as:

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

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

Thlaspi arvense (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