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: Photosynthetic plants convert solar energy to chemical bond energy in carbohydrates. 
Sentence2: Photosynthesis converts solar energy into chemical bond energy for themselves.

energy