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 , synthesized by the liver, contains HCO3-, bile salts and bile pigments. 
Sentence2: The liver reduces the acidity of food entering from the highly acidic stomach.

liver