bastard pimpernel vs chaffweed

bastard pimpernel and chaffweed both are nouns.

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

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

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

Other synonyms of bastard pimpernel include false pimpernel.

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