moldiness vs must

moldiness and must both are nouns.

Word	Noun	Adjective	Verb	Adverb
moldiness	Yes	No	No	No
must	Yes	Yes	No	No

As nouns, moldiness and must are synonyms defined as:

moldiness and must: the quality of smelling or tasting old or stale or mouldy

Other synonyms of moldiness include mustiness.

moldiness (noun)	must (noun)
the quality of smelling or tasting old or stale or mouldy	the quality of smelling or tasting old or stale or mouldy
	grape juice before or during fermentation
	a necessary or essential thing

moldiness (adjective)	must (adjective)
	highly recommended