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: refracting sunlight causes sunlight to split into different colors. 
Sentence2: Light splits into different colors when sunlight hits raindrops.

colors