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: measuring the hardness of minerals requires scratching those materials. 
Sentence2: To figure out the hardness of a mineral, the Moh's scale of hardness is used.
Example Output: minerals

Example Input: Sentence1: Amphibians have permeable skin that easily absorbs substances from the environment. 
Sentence2: permeable skin easily absorbs air to breathe through.
Example Output: absorbs

Example Input: Sentence1: For example, in the sentence The rain destroyed the crops , The rain is the subject. 
Sentence2: If weather is stormy then there is a chance of destroyed crops.
Example Output:
crops