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: Most of the energy a light bulb uses turns into heat. 
Sentence2: The electricity that a light bulb uses to produce light turns into heat.

heat