different between jouncy vs jounce

English

jounce +? -y

jouncy (comparative jouncier, superlative jounciest)

Of unknown origin, possibly a Portmanteau / Blend of jolt +? bounce.

jounce (third-person singular simple present jounces, present participle jouncing, simple past and past participle jounced)

(transitive, intransitive) To jolt; to shake, especially by rough riding or by driving over obstructions.
- 1931, William Faulkner, Sanctuary, Library of America, 1985, p.51:
  She felt herself swooping, then she was lying on the bed beside Gowan, on her back, jouncing to the dying chatter of the shucks.

jounce (countable and uncountable, plural jounces)

(physics) The fourth derivative of the position vector with respect to time; the time derivative of jerk.

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