Arecaceae vs Palmae

Arecaceae and Palmae both are nouns.

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

As nouns, Arecaceae and Palmae are synonyms defined as:

Arecaceae 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 Arecaceae include family Arecaceae, family Palmaceae, family Palmae, palm family, Palmaceae.

Arecaceae (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