Albizia julibrissin vs albizia

Albizia julibrissin and albizia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Albizia julibrissin	Yes	No	No	No
albizia	Yes	No	No	No

As nouns, albizia is a hypernym of Albizia julibrissin; that is, albizia is a word with a broader meaning than Albizia julibrissin:

Albizia julibrissin: attractive domed or flat-topped Asiatic tree having bipinnate leaves and flowers with long silky stamens
albizia: any of numerous trees of the genus Albizia

Other hypernyms of Albizia julibrissin include albizzia.

Albizia julibrissin (noun)	albizia (noun)
attractive domed or flat-topped Asiatic tree having bipinnate leaves and flowers with long silky stamens	any of numerous trees of the genus Albizia