genus Parrotia vs ironwood

genus Parrotia and ironwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Parrotia	Yes	No	No	No
ironwood	Yes	No	No	No

genus Parrotia (noun)	ironwood (noun)
one species: iron tree	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
	exceptionally tough or hard wood of any of a number of ironwood trees