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.

[EX Q]: Sentence1: An astronaut is a scientist who is a space explorer. 
Sentence2: Space explorers require preserved food for long flights.
[EX A]: explorer

[EX Q]: Sentence1: weathering means breaking down rocks from larger whole into smaller pieces by weather. 
Sentence2: Trash collectors work in all types of weather, including rain and snow.
[EX A]: weather

[EX Q]: Sentence1: Kitchen appliances include refrigerator. 
Sentence2: A kitchen appliances is used for keeping food fresh for a long period of time.
[EX A]:
Kitchen