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: Organisms cluster around hydrothermal vents in the ocean floor. 
Sentence2: Organisms cluster around hot water inside cracks in the ocean floor.

ocean