mumbling vs manduction

mumbling and manduction both are nouns.

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

As nouns, manduction is a hypernym of mumbling; that is, manduction is a word with a broader meaning than mumbling:

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

Other hypernyms of mumbling include chew, chewing, mastication.

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