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.

[EX Q]: Sentence1: If there is sun, there is sunlight, there is day. 
Sentence2: Energy enters ecosystems from the sun.
[EX A]: sun

[EX Q]: Sentence1: Interest in fossils is worldwide. 
Sentence2: paleontologists study something with worldwide interest.
[EX A]: Interest

[EX Q]: Sentence1: Some viruses live in a dormant state inside the body. 
Sentence2: Viral infection means there is a virus living in the body.
[EX A]:
body