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: Consider Input: Sentence1: chemical splashing can cause harm to humans. 
Sentence2: chemical splashing can cause harm to animals.

Output: cause


Input: Consider Input: Sentence1: Arthropods Arthropods have jointed segmented exoskeletons. 
Sentence2: Insects have jointed segmented exoskeletons.

Output: exoskeletons


Input: Consider Input: Sentence1: Adult worms go through a major transformation to develop reproductive organs. 
Sentence2: Mature adult worms are 5cm long.


Output: Adult