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.

Example Input: Sentence1: wiring requires an electrical conductor. 
Sentence2: Gold is an excellent conductor of electricity.
Example Output: conductor

Example Input: Sentence1: Enveloped viruses make their own membranes. 
Sentence2: Some viruses make their own membranes.
Example Output: make

Example Input: Sentence1: Fossils are the remains of ancient plant and animals or the traces of their activities. 
Sentence2: The remains of plants and animals are found where they used to live.
Example Output:
animals