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.
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Question: Sentence1: friction causes the temperature of an object to increase. 
Sentence2: internal combustion engines get hot.

Answer: temperature


Question: 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.

Answer: seismometer


Question: Sentence1: threatening behavior causes a fight-or-flight response in animals. 
Sentence2: Different behavior patterns are used by a threatened rabbit.

Answer:
threatening