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: Small prey, like a mouse or vole, is carried back to a feeding perch where it is swallowed whole. 
Sentence2: Some birds catch mice using their beak.

mouse