fanweed vs field pennycress

fanweed and field pennycress both are nouns.

Word	Noun	Adjective	Verb	Adverb
fanweed	Yes	No	No	No
field pennycress	Yes	No	No	No

As nouns, fanweed and field pennycress are synonyms defined as:

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

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

fanweed (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