cyma vs moulding

cyma and moulding both are nouns.

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

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

cyma: (architecture) a molding for a cornice; in profile it is shaped like an S (partly concave and partly convex)
moulding: a decorative strip used for ornamentation or finishing

Other hypernyms of cyma include molding.

cyma (noun)	moulding (noun)
(architecture) a molding for a cornice; in profile it is shaped like an S (partly concave and partly convex)	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