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.

Ex Input:
Sentence1: Infection is what ultimately leads to death. 
Sentence2: scraping oneself on a contaminated object may cause death.

Ex Output:
death


Ex Input:
Sentence1: Annelids have the amazing capacity to regrow segments that break off. 
Sentence2: Earthworms can regrow segments that break off.

Ex Output:
break


Ex Input:
Sentence1: Mollusks reproduce sexually. 
Sentence2: Interestingly, a squid is also a mollusk.

Ex Output:

Mollusks