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: thick fur can be used for keeping warm. 
Sentence2: Becuse of that, the fat layer was needed to keep warm, now that the fur coat was removed.

warm