nierembergia vs cupflower

nierembergia and cupflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
nierembergia	Yes	No	No	No
cupflower	Yes	No	No	No

As nouns, nierembergia and cupflower are synonyms defined as:

nierembergia and cupflower: any of various plants of the genus Nierembergia having upturned bell-shaped flowers

nierembergia (noun)	cupflower (noun)
any of various plants of the genus Nierembergia having upturned bell-shaped flowers	any of various plants of the genus Nierembergia having upturned bell-shaped flowers
	Mexican evergreen climbing plant having large solitary funnel-shaped fragrant yellow flowers with purple-brown ridges in the throat