square and rabbet vs molding

square and rabbet and molding both are nouns.

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

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

Other hypernyms of square and rabbet include moulding.

square and rabbet (noun)	molding (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
	the act of creating something by casting it in a mold
	a decorative recessed or relieved surface on an edge
	a decorative strip used for ornamentation or finishing
	sculpture produced by molding