siris tree vs albizzia

siris tree and albizzia both are nouns.

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

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

Other hypernyms of siris tree include albizia.

siris tree (noun)	albizzia (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