"Elastic" is a complete word in itself and describes something that can stretch and return to its original shape.
However, "elastic" can be used as part of compound words, like:
* Elasticity: Describes the ability of a material to stretch and return to its original shape.
* Elastics: A plural form of "elastic" that refers to rubber bands or similar stretchy objects.
* Elasticated: Describes something that is made with elastic material.
Let me know if you had a different word in mind, and I can help you find its suffix!