Rhapis excelsa vs lady palm

Rhapis excelsa and lady palm both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rhapis excelsa	Yes	No	No	No
lady palm	Yes	No	No	No

As nouns, lady palm is a hypernym of Rhapis excelsa; that is, lady palm is a word with a broader meaning than Rhapis excelsa:

Rhapis excelsa: small graceful palm with reedlike stems and leaf bases clothed with loose coarse fibers
lady palm: any of several small palms of the genus Rhapis; cultivated as houseplants

Rhapis excelsa (noun)	lady palm (noun)
small graceful palm with reedlike stems and leaf bases clothed with loose coarse fibers	any of several small palms of the genus Rhapis; cultivated as houseplants