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: 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: bacteria can cause people to become ill. 
Sentence2: bacteria can cause people to die.
answer:
bacteria


question:
Sentence1: adding salt to a solid decreases the freezing point of that solid. 
Sentence2: Another name for salt is sodium.
answer:

salt