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: Crops are plants that are grown for food or other uses. 
Sentence2: insects destroy plants.

Answer: plants


Question: Sentence1: an animal requires warmth for survival. 
Sentence2: Light and heat and warmth are basic necessities for survival.

Answer: warmth


Question: Sentence1: Watersheds are creeks, streams and rivers. 
Sentence2: a river is a watershred.

Answer:
Watersheds