Prunus mume vs mei

Prunus mume and mei both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus mume	Yes	No	No	No
mei	Yes	No	No	No

As nouns, Prunus mume and mei are synonyms defined as:

Prunus mume and mei: Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits

Other synonyms of Prunus mume include Japanese apricot.

Prunus mume (noun)	mei (noun)
Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits	Japanese ornamental tree with fragrant white or pink blossoms and small yellow fruits