ironwood vs genus Parrotia

ironwood and genus Parrotia both are nouns.

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

ironwood (noun)	genus Parrotia (noun)
a small slow-growing deciduous tree of northern Iran having a low domed shape	one species: iron tree
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