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: Roundworms Nearly all puppies and kittens have roundworms. 
Sentence2: Puppies and kittens may have parasitic worms.

kittens