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: Bile exits gallbladder by common bile duct. 
Sentence2: the gallbladder reduces the acidity of food entering from the highly acidic stomach.

gallbladder