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: Freeze-drying Freeze drying is a method of preserving materials. 
Sentence2: Freeze drying food keeps it viable for extended flights.

drying