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: Water is essential for all life on Earth. 
Sentence2: H2O is needed for all life on Eartth.
Example Output: Earth

Example Input: Sentence1: Damage is intensified by moisture stress during drought. 
Sentence2: low amounts of rainfall intensify damage during drought.
Example Output: Damage

Example Input: Sentence1: Viruses are usually considered to be nonliving. 
Sentence2: the simplest organisms known are usually considered to be nonliving.
Example Output:
considered