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: volcanic ash in the atmosphere decreases the temperature by blocking the sun. 
Sentence2: volcanic ash in the air around the earth decreases the temperature by blocking the sun.

temperature