Difference between Bounces and Bounciness

BOUNCES vs BOUNCINESS: NOUN

Rises, Recovers, Climbs, Soars, Jumps, Take a hop, Bound, Spring, Recoil, Bounciness, Leap, Jounce, Leaping, Ricochet, Rebound

Perkiness, Chirpiness, Peppiness, Liveliness, Silkiness, Sprightliness, Smoothness, Suppleness, Angularity, Fluffiness, Lightness, Litheness, Tautness, Springiness, Bounce

Wobbles, Swings, Higher, Rally, Rise, Rebounds, Jumps, Bound, Spring, Bounciness, Leap, Jounce, Leaping, Ricochet, Rebound

Tunefulness, Punchiness, Irrepressibility, Playfulness, Pliancy, Chirpiness, Peppiness, Liveliness, Silkiness, Smoothness, Angularity, Lightness, Litheness, Springiness, Bounce

That message bounces off the walls at Brown.
Catch the ball after it bounces back up.
Flexible material bounces back after squeezing the ball.
Her baby sister, Laura, bounces in my backpack.
Iverson bounces the familiar chestnut with both hands.
No cheque bounces reflect on my bank records.
What Should You Do If A Cheque Bounces?
The cricket ball seam is increased due to its stitching, therefore if the bowler bounces the ball on the seam it perhaps bounces indifferently.
Air molecules collide with each other, after a collision one bounces back and the next bounces forward, and so on.
Can be measured as hard bounces, soft bounces, or both.

If you like a combination of the hug of foams and the bounciness of coils, you can find that in a hybrid.
They come with extra bands that the user can add or take away to adjust the bounciness.
Its bounciness makes it easier to change sleeping positions and get up from the bed.
My problem statement is if age affects a tennis balls bounciness.