Areca catechu vs betel palm

Areca catechu and betel palm both are nouns.

Word	Noun	Adjective	Verb	Adverb
Areca catechu	Yes	No	No	No
betel palm	Yes	No	No	No

As nouns, Areca catechu and betel palm are synonyms defined as:

Areca catechu and betel palm: southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)

Other synonyms of Areca catechu include Areca palm.

Areca catechu (noun)	betel palm (noun)
southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)	southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)