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: People of all ages and activity levels perspire or sweat. 
Sentence2: Perspiration reduces body heat.

Answer: perspire


Question: Sentence1: All sharks are predators. 
Sentence2: hiding can be used for avoiding sharks.

Answer: sharks


Question: Sentence1: sweat is used for adjusting to hot temperatures by some animals. 
Sentence2: Generally the most effective way for animals to keep cool in hot weather is by sweating.

Answer:
hot