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: sand dunes are formed by the wind transporting and depositing sand. 
Sentence2: A habitat for several rare plant species is formed by the wind transporting and depositing sand.

sand