Areca palm vs areca

Areca palm and areca both are nouns.

Word	Noun	Adjective	Verb	Adverb
Areca palm	Yes	No	No	No
areca	Yes	No	No	No

As nouns, areca is a hypernym of Areca palm; that is, areca is a word with a broader meaning than Areca palm:

Areca palm: southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)
areca: any of several tall tropical palms native to southeastern Asia having egg-shaped nuts

Areca palm (noun)	areca (noun)
southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)	any of several tall tropical palms native to southeastern Asia having egg-shaped nuts