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: All frogs are amphibians. 
Sentence2: frogs have permeable skin that easily absorbs substances from the environment.
[EX A]: frogs

[EX Q]: Sentence1: friction causes the temperature of an object to increase. 
Sentence2: pressure causes the temperature of an object to increase.
[EX A]: causes

[EX Q]: Sentence1: An atmosphere is a layer of gases around a planet or natural satellite . 
Sentence2: Weather refers to the conditions of a layer of gases around a planet.
[EX A]:
around