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.

[Q]: Sentence1: Basically, heat is energy. 
Sentence2: Head hair is especially important in preventing energy loss from the body.
[A]: energy


[Q]: Sentence1: healing requires rest. 
Sentence2: healing requires time.
[A]: healing


[Q]: Sentence1: a battery converts chemical energy into electrical energy. 
Sentence2: Duracell batteries now come with a tester built into the package.
[A]:
battery