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: electric devices require electrical energy to function. 
Sentence2: Lie detectors are electrical or mechanical devices.
[EX A]: devices

[EX Q]: Sentence1: Plants that shed their leaves seasonally each year are called deciduous plants. 
Sentence2: vines shed their leaves seasonally each year.
[EX A]: each

[EX Q]: Sentence1: Viruses are so small that they can be seen only with an electron microscope. 
Sentence2: Once the camera is tuned with the microscope, the focusing depends on the microscope lens.
[EX A]:
microscope