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 the amount of available food and water decreases in an environment then animals may leave that environment to find food and water. 
Sentence2: If an environment is experiencing a drought then animals may leave that environment.

leave