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: Plants use the sun's energy to transform carbon dioxide gas and water into a sugar called glucose. 
Sentence2: Ethanol production is reliant on the sun's energy.

sun's