Synset
a person who speaks softly and indistinctly
<noun.person>
mumbler
murmurer
mutterer
lexical pointers
derivationally related form
mutter
mutter
lexical pointers
derivationally related form
mumble
lexical pointers
derivationally related form
murmur
murmur
murmur
semantic pointers
hypernym
speaker, talker, utterer, verbalizer, verbaliser