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: dew is formed when water vapor condenses over night. 
Sentence2: dew is formed when cooling  over night.
[EX A]: dew

[EX Q]: Sentence1: Fractures heal when osteoclasts form new bone. 
Sentence2: Fractures A fracture is a broken or cracked bone.
[EX A]: Fractures

[EX Q]: Sentence1: recycling has a positive impact on the environment. 
Sentence2: What's more, paper bags are recyclable themselves.
[EX A]:
recycling