Albizia saman vs albizia

Albizia saman and albizia both are nouns.

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

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

Other hypernyms of Albizia saman include albizzia.

Albizia saman (noun)	albizia (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