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: Deep burrowing earthworms improve soil porosity, water movement and plant root growth. 
Sentence2: Deep burrowing earthworms improve looseness of soil for root growth.

earthworms