red pimpernel vs Anagallis arvensis

red pimpernel and Anagallis arvensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
red pimpernel	Yes	No	No	No
Anagallis arvensis	Yes	No	No	No

As nouns, red pimpernel and Anagallis arvensis are synonyms defined as:

red pimpernel and Anagallis arvensis: herb with scarlet or white or purple blossoms that close at approach of rainy weather

Other synonyms of red pimpernel include poor man's weatherglass, scarlet pimpernel.

red pimpernel (noun)	Anagallis arvensis (noun)
herb with scarlet or white or purple blossoms that close at approach of rainy weather	herb with scarlet or white or purple blossoms that close at approach of rainy weather