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: Men seek the excitement of stimulants, because, for the time, the results are agreeable. 
Sentence2: Caffeine excites the central nervous system.

excitement