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: Urine is the liquid waste product of the body that is excreted by the urinary system. 
Sentence2: Liquid waste is put into the bladder.

liquid