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: pathogens can cause disease. 
Sentence2: pathogens affects the immune system.

Answer: pathogens


Question: Sentence1: Basically, heat is energy. 
Sentence2: Head hair is especially important in preventing energy loss from the body.

Answer: energy


Question: Sentence1: satellite technology is used for predicting the weather. 
Sentence2: satellite technology is used for predicting what it's like outside each day.

Answer:
predicting