four-o'clock family vs genus Bougainvillea

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

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

four-o'clock family (noun)	genus Bougainvillea (noun)
a family of flowering plants of the order Caryophyllales	ornamental tropical woody vines