Prunus mume vs apricot tree

Prunus mume and apricot tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus mume	Yes	No	No	No
apricot tree	Yes	No	No	No

As nouns, apricot tree is a hypernym of Prunus mume; that is, apricot tree is a word with a broader meaning than Prunus mume:

Prunus mume: Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits
apricot tree: Asian tree having clusters of usually white blossoms and edible fruit resembling the peach

Other hypernyms of Prunus mume include apricot.

Prunus mume (noun)	apricot tree (noun)
Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits	Asian tree having clusters of usually white blossoms and edible fruit resembling the peach