iron tree vs angiospermous tree

iron tree and angiospermous tree both are nouns.

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

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

iron tree: a small slow-growing deciduous tree of northern Iran having a low domed shape
angiospermous tree: any tree having seeds and ovules contained in the ovary

Other hypernyms of iron tree include flowering tree.

iron tree (noun)	angiospermous tree (noun)
a small slow-growing deciduous tree of northern Iran having a low domed shape	any tree having seeds and ovules contained in the ovary