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: Warmer temperatures increase melting of mountain glaciers and cause ocean water to expand. 
Sentence2: boulders can be formed by Warmer temperatures.

temperatures