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: Hurricanes are categorized by the Saffir-Simpson Scale. 
Sentence2: Something categorized by the Saffir-Simpson scale converts heat energy into mechanical energy.

categorized