instruction:
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.
question:
Sentence1: Smoking accelerates the aging process. 
Sentence2: smoking accelerates the death of cells.
answer:
Smoking


question:
Sentence1: intense heat has a negative impact on an organism. 
Sentence2: intense heat has a negative impact on plants.
answer:
heat


question:
Sentence1: Global warming threatens the entire planet. 
Sentence2: Gases released during the use of fossil fuels threaten the entire planet.
answer:

entire