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: Perishable food is what refrigerators, freezers, preservatives, and expiration dates are all about. 
Sentence2: Cooling things is a way to keep perishable foods.

Perishable