Difference between Mutter and Murmur

MUTTER vs MURMUR: NOUN

A low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
A murmur or murmuring; sullen or veiled utterance.
Repressed or obscure utterance.
A low grumble or indistinct utterance.
A repressed or obscure utterance; an instance of muttering.
Peas
A complaint uttered in a low and indistinct tone

The sound made by any condition which produces noisy, or turbulent, flow of blood through the heart.
Low or indistinct sounds or speech.
A complaint half suppressed, or uttered in a low, muttering voice.
A low, confused, and indistinct sound, like that of running water.
In medicine, any one of various sounds, normal and pathological, heard in auscultation.
A muttered complaint or protest; the expression of dissatisfaction in a low muttering voice; hence, any expression of complaint or discontent.
A low sound continued or continuously repeated, as that of a stream running in a stony channel, of a number of persons talking indistinctly in low tones, and the like; a low and confused or indistinct sound; a hum.
An indistinct, whispered, or confidential complaint; a mutter.
A low, indistinct, continuous sound.
An abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves
A low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
A complaint uttered in a low and indistinct tone
A schwa that is incidental to the pronunciation of a consonant
An abnormal sound, usually emanating from the heart, that sometimes indicates a diseased condition.

To utter words, especially complaints or angry expressions, indistinctly or with a low voice and lips partly closed; to say under one's breath.
To speak softly and incoherently, or with imperfect articulations.
To make a sound with a low, rumbling noise.
Talk indistinctly; usually in a low voice
Make complaining remarks or noises under one's breath

To sound with a low, rumbling noise.
To utter words indistinctly or with a low voice and lips partly closed; esp., to utter indistinct complaints or angry expressions; to grumble; to growl.
To speak indistinctly in low tones.
To complain or grumble morosely.
To utter or say in low indistinct tones.

To complain in low mumbling tones; grumble.
To say in a low indistinct voice; utter indistinctly.
To utter complaints in a low, half-articulated voice; to feel or express dissatisfaction or discontent; to grumble; -- often with at or against.
To make a low continued noise, like the hum of bees, a stream of water, distant waves, or the wind in a forest.
To make a low, continuous, indistinct sound or succession of sounds.

Talk indistinctly
A low continuous indistinct sound
Usually in a low voice
To utter with imperfect articulation, or in a low murmuring tone.
To emit a low rumbling sound.
To utter words in a low tone and with compressed lips, as in complaint or sullenness; murmur; grumble.

To make a low continuous noise, like the sound of rushing water or of the wind among trees, or like the hum of bees.
To utter words indistinctly; mutter.
Synonyms To repine, whimper.
To utter indistinctly; say in a low indistinct voice; mutter.
An abnormal sound of the heart
A low continuous indistinct sound
To grumble; complain; utter complaints in a low, muttering voice; hence, in general, to express complaint or discontent: with at or against.

Snigger, Exclaim, Groan, Moan, Mussitate, Murmuration, Maffle, Maunder, Gnarl, Croak, Grumbling, Murmur, Grumble, Murmuring, Mumble

Breathe, Breath, Gasp, Coo, Whisper, Murmuration, Murmur vowel, Cardiac murmur, Gnarl, Heart murmur, Croak, Grumble, Grumbling, Muttering, Mutter

Sotto voce, Yell, Shout, Blurt, Snigger, Exclaim, Groan, Moan, Maffle, Gnarl, Grumbling, Murmur, Grumble, Murmuring, Mumble

Blow, Blast, Blowing, Wind, Breathing, Breathe, Breath, Gasp, Whisper, Gnarl, Heart murmur, Grumble, Grumbling, Muttering, Mutter

Murmur also answered questions I had and helped.
There was a murmur of surprise and awe.
Did ever murmur spring from lips of thine?
The man fell dead without a murmur, watching.
Conservative, but even I am beginning to murmur.
A murmur of protest rippled across the ballroom.
The murmur itself is not treated; the underlying cause of the murmur may or may not be treated.
An echocardiogram is necessary to differentiate between a heart murmur that is just due to excitement versus a heart murmur from underlying heart disease.
The drowsing murmur of the five and twenty studying scholars soothed the soul like the spell that is in the murmur of bees.
On auscultation, the diastolic decrescendo murmur is softer, shorter, and lower pitched than the murmur heard with chronic AR.