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: microscope is used to see small things by biologists by making them appear bigger. 
Sentence2: Something invented by Leeuwenhoek is used to see small things by biologists by making them appear bigger.

Answer: appear


Question: Sentence1: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: Coral reefs provide food and shelter to animals that require salinity.

Answer:
Coral