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.

Example Input: Sentence1: infection can cause bodily tissues to swell. 
Sentence2: Bacteria can cause bodily tissues to swell.
Example Output: bodily

Example Input: Sentence1: For example, insulin is a protein hormone. 
Sentence2: Insulin is produced in a part of the cell called the ribosome.
Example Output: insulin

Example Input: Sentence1: Mackinac Bridge: Completed in 1957, the five-mile-long suspension bridge (WORLD'S LONGEST SUSPENSION BRIDGE) connects Michigan's peninsulas across the Straits of Mackinac. 
Sentence2: cables are used for support by the bridge that connects Michigan's peninsulas.
Example Output:
Michigan's