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: Hairs stand on end, the heart races and fight or flight hormones flood the body. 
Sentence2: threatening behavior causes the heart to race and hormones to flood the body.

hormones