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 thermal pollution is severe, then the entire aquatic ecosystem can be destroyed. 
Sentence2: Pesticides can cause entire ecosystems to be destroyed.

destroyed