field pennycress vs French weed

field pennycress and French weed both are nouns.

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

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

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

Other synonyms of field pennycress include fanweed, mithridate mustard, penny grass, stinkweed, Thlaspi arvense.

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