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: Wells are usually used as a source for groundwater. 
Sentence2: Wells can be filled with precipitation that falls on land and soaks into the ground.

Wells