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: Fog happens when the water vapor condenses into particles as air temperatures cool. 
Sentence2: dew is formed when fog condenses over night.

Fog