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: When water vapor condenses overnight, the temperature has reached the dew point.
[EX A]: condenses

[EX Q]: Sentence1: a sifter is used for separating mixtures. 
Sentence2: a sifter is used for some recipes.
[EX A]: sifter

[EX Q]: Sentence1: Millions of people fly safely in airplanes every year. 
Sentence2: Airplanes transport millions of humans move across bodies of water every year.
[EX A]:
Millions