manduction vs mumbling

manduction and mumbling both are nouns.

Word	Noun	Adjective	Verb	Adverb
manduction	Yes	No	No	No
mumbling	Yes	No	No	No

As nouns, mumbling is a hyponym of manduction; that is, mumbling is a word with a more specific, narrower meaning than manduction:

manduction: biting and grinding food in your mouth so it becomes soft enough to swallow
mumbling: ineffectual chewing (as if without teeth)

Other hyponyms of manduction include chomping, gumming, rumination.

manduction (noun)	mumbling (noun)
biting and grinding food in your mouth so it becomes soft enough to swallow	ineffectual chewing (as if without teeth)
the act of participating in the celebration of the Eucharist	indistinct enunciation