There are several synonyms that can be used in place of the word "bouncinesses". These include resilience, elasticity, springiness, and buoyancy. Resilience refers to the ability of a material or object to recover its original shape after being compressed or stretched. Elasticity refers to the ability of a material or object to stretch and return to its original shape. Springiness refers to the ability of an object to spring back quickly after being compressed or stretched. Buoyancy, on the other hand, refers to the ability of an object to float on a liquid or gas. All of these synonyms describe the property of an object that allows it to bounce or rebound after being impacted.