valance board vs cornice

valance board and cornice both are nouns.

Word	Noun	Adjective	Verb	Adverb
valance board	Yes	No	No	No
cornice	Yes	No	Yes	No

As nouns, valance board and cornice are synonyms defined as:

valance board and cornice: a decorative framework to conceal curtain fixtures at the top of a window casing

Other synonyms of valance board include pelmet, valance.

valance board (noun)	cornice (noun)
a decorative framework to conceal curtain fixtures at the top of a window casing	the topmost projecting part of an entablature
	a molding at the corner between the ceiling and the top of a wall
	a decorative framework to conceal curtain fixtures at the top of a window casing

valance board (verb)	cornice (verb)
	furnish with a cornice