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