necking vs moulding

necking and moulding both are nouns.

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

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

Other hypernyms of necking include molding.

necking (noun)	moulding (noun)
affectionate play (or foreplay without contact with the genital organs)	a preliminary sculpture in wax or clay from which a finished work can be copied
the molding at the top of a column	a decorative recessed or relieved surface on an edge
	a decorative strip used for ornamentation or finishing
	sculpture produced by molding