square and rabbet vs moulding

square and rabbet and moulding both are nouns.

Word	Noun	Adjective	Verb	Adverb
square and rabbet	Yes	No	No	No
moulding	Yes	No	No	No

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

Other hypernyms of square and rabbet include molding.

square and rabbet (noun)	moulding (noun)
molding in the form of a ring; at top of a column	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