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: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.
Example Output: DNA

Example Input: Sentence1: Animals can communicate with sounds, chemicals, or visual cues. 
Sentence2: cats can communicate with sounds, chemicals or visual cues.
Example Output: chemicals

Example Input: Sentence1: a plant requires photosynthesis to grow. 
Sentence2: Hexazinone inhibits a plant to grow.
Example Output:
grow