French weed vs field pennycress

French weed and field pennycress both are nouns.

Word	Noun	Adjective	Verb	Adverb
French weed	Yes	No	No	No
field pennycress	Yes	No	No	No

As nouns, French weed and field pennycress are synonyms defined as:

French weed and field pennycress: foetid Eurasian weed having round flat pods; naturalized throughout North America

Other synonyms of French weed include fanweed, mithridate mustard, penny grass, stinkweed, Thlaspi arvense.

French weed (noun)	field pennycress (noun)
foetid Eurasian weed having round flat pods; naturalized throughout North America	foetid Eurasian weed having round flat pods; naturalized throughout North America