siris tree vs albizia

siris tree and albizia both are nouns.

Word	Noun	Adjective	Verb	Adverb
siris tree	Yes	No	No	No
albizia	Yes	No	No	No

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

siris tree: large spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the wind
albizia: any of numerous trees of the genus Albizia

Other hypernyms of siris tree include albizzia.

siris tree (noun)	albizia (noun)
large spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the wind	any of numerous trees of the genus Albizia