iron tree vs ironwood tree

iron tree and ironwood tree both are nouns.

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

As nouns, iron tree and ironwood tree are synonyms defined as:

iron tree and ironwood tree: a small slow-growing deciduous tree of northern Iran having a low domed shape

Other synonyms of iron tree include iron-tree, ironwood.

iron tree (noun)	ironwood tree (noun)
a small slow-growing deciduous tree of northern Iran having a low domed shape	a small slow-growing deciduous tree of northern Iran having a low domed shape
	medium-sized hop hornbeam of eastern North America
	handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties