pepper family vs family Piperaceae

pepper family and family Piperaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper family	Yes	No	No	No
family Piperaceae	Yes	No	No	No

As nouns, pepper family and family Piperaceae are synonyms defined as:

pepper family and family Piperaceae: tropical woody vines and herbaceous plants having aromatic herbage and minute flowers in spikelets

Other synonyms of pepper family include Piperaceae.

pepper family (noun)	family Piperaceae (noun)
tropical woody vines and herbaceous plants having aromatic herbage and minute flowers in spikelets	tropical woody vines and herbaceous plants having aromatic herbage and minute flowers in spikelets