molding vs cornice

molding and cornice both are nouns.

Word	Noun	Adjective	Verb	Adverb
molding	Yes	No	No	No
cornice	Yes	No	Yes	No

As nouns, cornice is a hyponym of molding; that is, cornice is a word with a more specific, narrower meaning than molding:

molding (noun)	cornice (noun)
a preliminary sculpture in wax or clay from which a finished work can be copied	the topmost projecting part of an entablature
the act of creating something by casting it in a mold	a molding at the corner between the ceiling and the top of a wall
a decorative recessed or relieved surface on an edge	a decorative framework to conceal curtain fixtures at the top of a window casing
a decorative strip used for ornamentation or finishing
sculpture produced by molding

molding (verb)	cornice (verb)
	furnish with a cornice