Nyctaginaceae vs four-o'clock family

Nyctaginaceae and four-o'clock family both are nouns.

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

As nouns, Nyctaginaceae and four-o'clock family are synonyms defined as:

Nyctaginaceae and four-o'clock family: a family of flowering plants of the order Caryophyllales

Other synonyms of Nyctaginaceae include Allioniaceae, family Allioniaceae, family Nyctaginaceae.

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