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: Arthropods Arthropods have jointed segmented exoskeletons. 
Sentence2: Insects have jointed segmented exoskeletons.
Example Output: exoskeletons

Example Input: Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.
Example Output: Ribosomes

Example Input: Sentence1: Ice is manufactured and stored during the night and used during the day for cooling the building. 
Sentence2: a freezer is used for storing things.
Example Output:
stored