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: When kidney function is normal, creatinine is removed from the body by the kidneys. 
Sentence2: Nephrons are necessary to remove creatinine from the body.

creatinine