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: Every photograph is produced by a camera. 
Sentence2: Photographers record images.

Answer: photograph


Question: Sentence1: sharpening an object causes that object to change shape. 
Sentence2: sharpening a knife causes it to change shape.

Answer: causes


Question: Sentence1: a pesticide is used for protecting plants by killing insects. 
Sentence2: Pesticides protect crops from being eaten by pests.

Answer:
pesticide