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: Smoking accelerates the aging process. 
Sentence2: smoking accelerates the death of cells.

Answer: Smoking


Question: Sentence1: Specialization occurs when competing species evolve different adaptations. 
Sentence2: evolving different adaptations increases survival.

Answer: adaptations


Question: Sentence1: Forecast changes in wind speed and direction at 850 mb should be used in formulating forecasts of surface winds for the narrative fire weather forecast and the point forecast for Finney Creek. 
Sentence2: Anemometers help prevent forest fires.

Answer:
fire