family Gentianaceae vs gentian family

family Gentianaceae and gentian family both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Gentianaceae	Yes	No	No	No
gentian family	Yes	No	No	No

As nouns, family Gentianaceae and gentian family are synonyms defined as:

family Gentianaceae and gentian family: chiefly herbaceous plants with showy flowers; some are cultivated as ornamentals

Other synonyms of family Gentianaceae include Gentianaceae.

family Gentianaceae (noun)	gentian family (noun)
chiefly herbaceous plants with showy flowers; some are cultivated as ornamentals	chiefly herbaceous plants with showy flowers; some are cultivated as ornamentals