instruction:
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.
question:
Sentence1: a stopwatch is used to measure time. 
Sentence2: Time can be measured with a clock or watch.
answer:
measure


question:
Sentence1: Very often their only metal object in the house is a cooking pot or a knife. 
Sentence2: sharpening a knife causes it to change shape.
answer:
knife


question:
Sentence1: Hurricanes can cause severe damage. 
Sentence2: mechanical energy can cause severe damage.
answer:

damage