Palmaceae vs Palmae

Palmaceae and Palmae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Palmaceae	Yes	No	No	No
Palmae	Yes	No	No	No

As nouns, Palmaceae and Palmae are synonyms defined as:

Palmaceae and Palmae: chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales

Other synonyms of Palmaceae include Arecaceae, family Arecaceae, family Palmaceae, family Palmae, palm family.

Palmaceae (noun)	Palmae (noun)
chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales	chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales