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: Waldron buckles with lead foil made up the seat belts. 
Sentence2: Waldron buckles with lead are used to prevent injuries to passengers in cars.

buckles