French weed vs fanweed

French weed and fanweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
French weed	Yes	No	No	No
fanweed	Yes	No	No	No

As nouns, French weed and fanweed are synonyms defined as:

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

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

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