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: If there is sun, there is sunlight, there is day. 
Sentence2: Energy enters ecosystems from the sun.

Answer: sun


Question: Sentence1: Blood type is important for medical reasons. 
Sentence2: Type O is important for medical reasons.

Answer: important


Question: Sentence1: electric devices require electrical energy to function. 
Sentence2: Electrical fields result from electrical devices and televisions.

Answer:
devices