Albizia julibrissin vs albizzia

Albizia julibrissin and albizzia both are nouns.

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

As nouns, albizzia is a hypernym of Albizia julibrissin; that is, albizzia 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
albizzia: any of numerous trees of the genus Albizia

Other hypernyms of Albizia julibrissin include albizia.

Albizia julibrissin (noun)	albizzia (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