What's the difference between jaunce and jounce?

Jaunce

Definition:

• (v. i.) To ride hard; to jounce.

Example Sentences:

Jounce

Definition:

• (v. t. & i.) To jolt; to shake, especially by rough riding or by driving over obstructions.
• (n.) A jolt; a shake; a hard trot.

Example Sentences:

• (1) He motioned for his daughter to stay still and looked through his binoculars at lights jouncing on the shingle.