enunciation vs mumbling

enunciation and mumbling both are nouns.

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

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

enunciation: the articulation of speech regarded from the point of view of its intelligibility to the audience
mumbling: indistinct enunciation

enunciation (noun)	mumbling (noun)
the articulation of speech regarded from the point of view of its intelligibility to the audience	ineffectual chewing (as if without teeth)
	indistinct enunciation