scarlet pimpernel vs Anagallis arvensis

scarlet pimpernel and Anagallis arvensis both are nouns.

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

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

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

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

scarlet 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