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: wind is used for producing electricity. 
Sentence2: Winds are caused by pressure differences.

Answer: wind


Question: Sentence1: healing requires rest. 
Sentence2: healing requires time.

Answer: healing


Question: Sentence1: Moles and gophers spend their lives underground. 
Sentence2: moles and gophers spend their lives hiding from predators.

Answer:
Moles