Martyniaceae vs plant family

Martyniaceae and plant family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Martyniaceae	Yes	No	No	No
plant family	Yes	No	No	No

As nouns, plant family is a hypernym of Martyniaceae; that is, plant family is a word with a broader meaning than Martyniaceae:

Martyniaceae: in most classifications not considered a separate family but included in the Pedaliaceae
plant family: a family of plants

Martyniaceae (noun)	plant family (noun)
in most classifications not considered a separate family but included in the Pedaliaceae	a family of plants