Albizia saman vs albizzia

Albizia saman and albizzia both are nouns.

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

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

Albizia saman: large ornamental tropical American tree with bipinnate leaves and globose clusters of flowers with crimson stamens and seed pods that are eaten by cattle
albizzia: any of numerous trees of the genus Albizia

Other hypernyms of Albizia saman include albizia.

Albizia saman (noun)	albizzia (noun)
large ornamental tropical American tree with bipinnate leaves and globose clusters of flowers with crimson stamens and seed pods that are eaten by cattle	any of numerous trees of the genus Albizia