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: DNA is made up of nucleotides. 
Sentence2: Mutations can change the structure of DNA.
Example Output: DNA

Example Input: Sentence1: Basically the process is pretty simple. 
Sentence2: All cells share some of the same structures and simple processes.
Example Output: process

Example Input: Sentence1: Oral cancers can be deadly. 
Sentence2: deadly genes can be inherited.
Example Output:
deadly