elm family vs family Ulmaceae

elm family and family Ulmaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
elm family	Yes	No	No	No
family Ulmaceae	Yes	No	No	No

As nouns, elm family and family Ulmaceae are synonyms defined as:

elm family and family Ulmaceae: a dicot family of the order Urticales including: genera Ulmus, Celtis, Planera, Trema

Other synonyms of elm family include Ulmaceae.

elm family (noun)	family Ulmaceae (noun)
a dicot family of the order Urticales including: genera Ulmus, Celtis, Planera, Trema	a dicot family of the order Urticales including: genera Ulmus, Celtis, Planera, Trema