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: Autumn brings the changing of the seasons.
Sentence2: Earth 's tilt on its rotating axis causes autumn.
Example Output: Autumn

Example Input: Sentence1: Macroevolution occurs over geologic time above the level of the species.
Sentence2: adding new genes with special capability occurs over geologic time above the level of the species.
Example Output: above

Example Input: Sentence1: Foods usually were covered with copious quantities of salt or saturated salt brine, and the salt was allowed to infuse into the tissue while dehydrating the product.
Sentence2: Salting food preserves it.
Example Output:
Foods