chaffweed vs bastard pimpernel

chaffweed and bastard pimpernel both are nouns.

Word	Noun	Adjective	Verb	Adverb
chaffweed	Yes	No	No	No
bastard pimpernel	Yes	No	No	No

As nouns, chaffweed and bastard pimpernel are synonyms defined as:

chaffweed and bastard pimpernel: weedy plant having short dry chafflike leaves

Other synonyms of chaffweed include false pimpernel.

chaffweed (noun)	bastard pimpernel (noun)
weedy plant having short dry chafflike leaves	weedy plant having short dry chafflike leaves