subbase vs moulding

subbase and moulding both are nouns.

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

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

Other hypernyms of subbase include molding.

subbase (noun)	moulding (noun)
the lowest molding of an architectural base or of a baseboard	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