nectarine tree vs nectarine

nectarine tree and nectarine both are nouns.

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

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

nectarine tree and nectarine: variety or mutation of the peach bearing fruit with smooth skin and (usually) yellow flesh

Other synonyms of nectarine tree include Prunus persica nectarina.

nectarine tree (noun)	nectarine (noun)
variety or mutation of the peach bearing fruit with smooth skin and (usually) yellow flesh	a variety or mutation of the peach that has a smooth skin
	variety or mutation of the peach bearing fruit with smooth skin and (usually) yellow flesh