different between quakingly vs quackingly

English

quaking +? -ly

quakingly (comparative more quakingly, superlative most quakingly)

In a quaking fashion, especially with fear.
He reads out the name of the boy, who rises respectfully and quakingly to his feet.

quacking +? -ly

quackingly (comparative more quackingly, superlative most quackingly)

In a quacking manner; with quacking sounds.
- 1912, The English Illustrated Magazine
  ...expressing their satisfaction in deep, megaphone voices, until they are quite sure we have heard, when they go quackingly away to the nearest pond.
- 1985, Joel Flegler, Fanfare
  ...some smartly styled but quackingly played overtures by the Monte Carlo Operators under Louis Frémaux...

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