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: Fall rains cause the germination of the annual grassland plants that grow slowly during winter and then grow rapidly in the spring as temperatures rise. 
Sentence2: Water vapor causes plants to grow.

grow