foliaceous vs folium

foliaceous is not a noun while folium is a noun.

Word	Noun	Adjective	Verb	Adverb
foliaceous	No	Yes	No	No
folium	Yes	No	No	No

foliaceous (noun)	folium (noun)
	a thin layer or stratum of (especially metamorphic) rock

foliaceous (adjective)	folium (adjective)
of or pertaining to or resembling the leaf of a plant
bearing numerous leaves
(especially of metamorphic rock) having thin leaflike layers or strata