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: a seismometer is used to measure the strength or magnitude of an earthquake. 
Sentence2: Seismometer Calibration : Instructions on how to calibrate a homemade seismometer.
[EX A]: seismometer

[EX Q]: Sentence1: Asbestos is a dangerous carcinogen. 
Sentence2: Asbestos causes cancer.
[EX A]: Asbestos

[EX Q]: Sentence1: producing thrust causes something to move. 
Sentence2: Engines are used to generate thrust.
[EX A]:
thrust