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: Sonar bounces sound waves off the bottom of the ocean. 
Sentence2: Bouncing sound waves off the bottom of the ocean is used to find locations of objects.

waves