ailanthus vs angiospermous tree

ailanthus and angiospermous tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
ailanthus	Yes	No	No	No
angiospermous tree	Yes	No	No	No

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

Other hypernyms of ailanthus include flowering tree.

ailanthus (noun)	angiospermous tree (noun)
any of several deciduous Asian trees of the genus Ailanthus	any tree having seeds and ovules contained in the ovary