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: Brain sites implicated include the brainstem and cerebellum. 
Sentence2: Many nerve pathways link brain sites with motor neurons throughout the body.

sites