Apricot tree and Japanese apricot

Apricot tree noun - Asian tree having clusters of usually white blossoms and edible fruit resembling the peach.

Japanese apricot and apricot tree are semantically related. In some cases you can replace phrase "Japanese apricot" with "Apricot tree", this phrases are similar.

Japanese apricot noun - Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits.

Apricot tree and Japanese apricot are semantically related. You can use "Apricot tree" instead a noun phrase "Japanese apricot".