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: Microbes are also called bacteria or microorganisms. 
Sentence2: Disease-causing bacteria have a negative impact on the body.

Ex Output:
bacteria


Ex Input:
Sentence1: Coral Reefs Coral reefs are widely distributed in warm shallow waters. 
Sentence2: warm shallow waters provide food and shelter to many ocean organisms.

Ex Output:
shallow


Ex Input:
Sentence1: Ribosomes are sites where proteins are made. 
Sentence2: Endoplasmic reticulum are membranes attached to sites where proteins are made.

Ex Output:

are