baseboard vs moulding

baseboard and moulding both are nouns.

Word	Noun	Adjective	Verb	Adverb
baseboard	Yes	No	No	No
moulding	Yes	No	No	No

As nouns, moulding is a hypernym of baseboard; that is, moulding is a word with a broader meaning than baseboard:

Other hypernyms of baseboard include molding.

baseboard (noun)	moulding (noun)
a molding covering the joint formed by a wall and the floor	a preliminary sculpture in wax or clay from which a finished work can be copied
	a decorative recessed or relieved surface on an edge
	a decorative strip used for ornamentation or finishing
	sculpture produced by molding