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: exercise increases a body 's strength. 
Sentence2: Exercise is more than running and lifting.

Answer: exercise


Question: Sentence1: Streams may start with runoff or water seeping out of a spring. 
Sentence2: Most water comes from precipitation.

Answer: water


Question: Sentence1: Fluid milk is fortified with vitamin D and rich in calcium. 
Sentence2: Milk is nutritious because it has vitamin D and calcium.

Answer:
calcium