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: freezing means changing from a liquid into a solid by reducing heat energy. 
Sentence2: Water freezes into ice when cooled.
answer:
freezing


question:
Sentence1: wind is used for producing electricity. 
Sentence2: Winds are caused by pressure differences.
answer:
wind


question:
Sentence1: Where there is an environment, there is life within it. 
Sentence2: Bioterrorism is another potential threat to life within it.
answer:

life