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.
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Question: 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.

Answer: Stress


Question: Sentence1: exercise increases a body 's strength. 
Sentence2: Exercise is more than running and lifting.

Answer: exercise


Question: Sentence1: a pesticide is used for protecting plants by killing insects. 
Sentence2: Protecting plants can sometimes come at the expense of harming small animals.

Answer:
plants