Definition: 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.
Input: Sentence1: Carbon Monoxide Carbon monoxide is a health hazard. 
Sentence2: Furnaces and other devices that burn fuel are health hazards.

health