four-o'clock family vs genus Mirabilis

four-o'clock family and genus Mirabilis both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-o'clock family	Yes	No	No	No
genus Mirabilis	Yes	No	No	No

four-o'clock family (noun)	genus Mirabilis (noun)
a family of flowering plants of the order Caryophyllales	four o'clocks