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: Chloroplasts Chloroplasts serve as the site of photosynthesis. 
Sentence2: The site of photosynthesis in plant and algae cells is found within organelles.

photosynthesis