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: if an object is made of a material then that object has the properties of that material. 
Sentence2: Every object in the game has mass, density, and material properties.

properties