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: Stimuli are detected by sensory nerve cells. 
Sentence2: When there is a release of pain, the nerve cells in the spinal cord are stimulated.

cells