maiden blue-eyed Mary vs genus Collinsia

maiden blue-eyed Mary and genus Collinsia both are nouns.

Word	Noun	Adjective	Verb	Adverb
maiden blue-eyed Mary	Yes	No	No	No
genus Collinsia	Yes	No	No	No

maiden blue-eyed Mary (noun)	genus Collinsia (noun)
small widely branching western plant with tiny blue-and-white flowers; British Columbia to Ontario and south to California and Colorado	genus of hardy annual herbs of western United States