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: Fingernails prevent injury by forming protective plates over the ends of the fingers. 
Sentence2: A hard, curved plate of keratin prevents injury to the ends of extremities.

ends