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: When it is tilted away from the sun, it is winter. 
Sentence2: The side of the earth receiving less energy from the sun is experiencing winter.

winter