Erythroxylaceae vs plant family

Erythroxylaceae and plant family both are nouns.

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

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

Erythroxylaceae: a family of plants of order Geraniales; have drupaceous fruit
plant family: a family of plants

Erythroxylaceae (noun)	plant family (noun)
a family of plants of order Geraniales; have drupaceous fruit	a family of plants