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: Algae and many other aquatic plants are eaten by a variety of invertebrates and fish. 
Sentence2: Certain aquatic organisms eaten by fish have varied life cycles.

fish