Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

Q: Sentence1: Stress is the applied force, strain is the change in shape. 
Sentence2: Paper is crumbled when stress and strain is applied in order to change the shape.

A: Stress
****
Q: Sentence1: Faster metabolism means more calories consumed, and usually, weight loss. 
Sentence2: mammals generate heat by consuming calories.

A: calories
****
Q: Sentence1: a delta is formed by deposition of sediment at the mouth of a river by water fanning out. 
Sentence2: deposition of sediment at the mouth of a river by water fanning out is called by a Greek letter.

A:
deposition
****