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: Distance is measured in meters the SI unit of distance. 
Sentence2: The SI unit of distance is in meters.

Answer: SI


Question: Sentence1: Some viruses live in a dormant state inside the body. 
Sentence2: a virus can live in the brain.

Answer: viruses


Question: Sentence1: Scratches cause problems. 
Sentence2: measuring the hardness of minerals cause problems.

Answer:
cause