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: Another major type of wind is called a polar easterly. 
Sentence2: Unequal heating of Earth 's surface by the Sun causes polar easterlies.

polar