coconut vs coconut tree

coconut and coconut tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
coconut	Yes	No	No	No
coconut tree	Yes	No	No	No

As nouns, coconut and coconut tree are synonyms defined as:

coconut and coconut tree: tall palm tree bearing coconuts as fruits; widely planted throughout the tropics

Other synonyms of coconut include coco, coco palm, cocoa palm, coconut palm, Cocos nucifera.

coconut (noun)	coconut tree (noun)
large hard-shelled oval nut with a fibrous husk containing thick white meat surrounding a central cavity filled (when fresh) with fluid or milk	tall palm tree bearing coconuts as fruits; widely planted throughout the tropics
the edible white meat of a coconut; often shredded for use in e.g. cakes and curries
tall palm tree bearing coconuts as fruits; widely planted throughout the tropics