different between flapping vs flopping

English

flapping (not comparable)

flapping (countable and uncountable, plural flappings)

An instance where one flaps.
(phonology) A phonological process found in many dialects of English, especially American English and Canadian English, by which intervocalic /t/ and /d/ surface as the alveolar flap /?/ before an unstressed syllable, so that words such as "metal" and "medal" are pronounced similarly or identically.
(computing, telecommunications) The situation where a resource, a network destination, etc., is advertised as being available and then unavailable (or available by different routes) in rapid succession.

flapping

flopping

flopping (plural floppings)

The motion of something that flops.
- 1916, Ezra Pound, Gaudier-Brzeska: A Memoir
  […] it belongs to the realm of magnetic currents or to the binding properties of steel girders and not to the floppings of grass or the contours of the parochial churchyard.

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