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: Insects may live in large colonies and have complex social behaviors. 
Sentence2: Arthropods with wings may live in large colonies and have complex social behaviors.

social