Difference between Grumble and Croak

GRUMBLE vs CROAK: NOUN

Make complaining remarks or noises under one's breath
Show one's unhappiness or critical attitude
Make a low noise
To utter or emit low dull rumbling sounds
To make a low, growling or rumbling noise, like a hungry stomach or certain animals.
To complain.
To utter in a grumbling fashion.

Utter a hoarse sound, like a raven
Make complaining remarks or noises under one's breath
Die
To make a croak.
Of a frog, to make its cry.
Of a raven, to make its cry.
To kill someone or something.
Pass from physical life and lose all bodily attributes and functions necessary to sustain life

To complain in a surly manner; mutter discontentedly.
To rumble or growl.
To express in a grumbling discontented manner.
To rumble; to make a low, harsh, and heavy sound; to mutter.
To growl; to snarl in deep tones.
To murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.

To kill.
To utter a low hoarse sound.
To speak with a low hoarse voice.
To mutter discontentedly; grumble.
To die.
To make a low, hoarse noise in the throat, as a frog, a raven, or a crow; hence, to make any hoarse, dismal sound.
To complain; especially, to grumble; to forebode evil; to utter complaints or forebodings habitually.
To utter in a low hoarse sound.

To utter a low, hoarse, dismal cry or sound, as a frog, a raven, or a crow: also used humorously of the hoarse utterance of a person having a heavy cold.
To speak with a low, hollow voice, or in dismal accents; forebode evil; complain; grumble.
To die: from the gurgling or rattling sound in the throat of a dying person.
To utter in a low, hollow voice; murmur dismally.
To announce or herald by croaking.

Griping, Moan, Complain, Jones, Gnarl, Grouch, Croak, Rumble, Rumbling, Growl, Murmuring, Scold, Murmur, Muttering, Mutter

Die, Buy the farm, Die unexpectedly, Kick the bucket, Snuff it, Pop off, Die suddenly, Cronk, Drop dead, Gnarl, Choke, Grumble, Conk, Mutter, Murmur

Grousing, Whine, Griping, Moan, Jones, Gnarl, Grouch, Rumble, Rumbling, Growl, Murmuring, Scold, Murmur, Muttering, Mutter

Cackle, Quaver, Wail, Warble, Mewl, Shoot, Kill, Die, Snuff it, Drop dead, Gnarl, Choke, Grumble, Mutter, Murmur

Officer Ryan Croak is a recent transfer from the Rockland Police Department.
Alpern, Jim Croak, Deborah Buck, Bastienne Schmidt, Agathe Snow, and Maria Vasconcelos.
Frogs croak in the space she leaves between piano chords.
Filthily misbegotten gurnard can croak soothingly behind the factious moro.
With one ________, these ancient amphibians will make anyone croak.
According to Jordan, it let out a hacking croak.
You got the go sign to croak yourselves.
Were solution for this Croak Crossword clue have.
Returns invoice hashref or croak if error occurred.
Switch normal output to STDOUT, added croak call.