different between throb vs quop

English

From Middle English throbben; possibly of imitative origin.

throb (third-person singular simple present throbs, present participle throbbing, simple past and past participle throbbed)

(intransitive) To pound or beat rapidly or violently.
(intransitive) To vibrate or pulsate with a steady rhythm.
(intransitive, of a body part) To pulse (often painfully) in time with the circulation of blood.

throb (plural throbs)

quop (third-person singular simple present quops, present participle quopping, simple past and past participle quopped)

(intransitive) To throb or beat.
- 1922, James Joyce, Ulysses
  His heart quopped softly.

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