Cocos nucifera vs palm tree

Cocos nucifera and palm tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cocos nucifera	Yes	No	No	No
palm tree	Yes	No	No	No

As nouns, palm tree is a hypernym of Cocos nucifera; that is, palm tree is a word with a broader meaning than Cocos nucifera:

Cocos nucifera: tall palm tree bearing coconuts as fruits; widely planted throughout the tropics
palm tree: any plant of the family Palmae having an unbranched trunk crowned by large pinnate or palmate leaves

Other hypernyms of Cocos nucifera include palm.

Cocos nucifera (noun)	palm tree (noun)
tall palm tree bearing coconuts as fruits; widely planted throughout the tropics	any plant of the family Palmae having an unbranched trunk crowned by large pinnate or palmate leaves