red pimpernel vs poor man's weatherglass

red pimpernel and poor man's weatherglass both are nouns.

Word	Noun	Adjective	Verb	Adverb
red pimpernel	Yes	No	No	No
poor man's weatherglass	Yes	No	No	No

As nouns, red pimpernel and poor man's weatherglass are synonyms defined as:

red pimpernel and poor man's weatherglass: herb with scarlet or white or purple blossoms that close at approach of rainy weather

Other synonyms of red pimpernel include Anagallis arvensis, scarlet pimpernel.

red pimpernel (noun)	poor man's weatherglass (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