four-o'clock family vs order Caryophyllales

four-o'clock family and order Caryophyllales both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-o'clock family	Yes	No	No	No
order Caryophyllales	Yes	No	No	No

four-o'clock family (noun)	order Caryophyllales (noun)
a family of flowering plants of the order Caryophyllales	corresponds approximately to the older group Centrospermae