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: Hydrogen bonds cause water to expand when it freezes. 
Sentence2: Water freezes into ice when cooled.
[EX A]: freezes

[EX Q]: Sentence1: infection can cause bodily tissues to swell. 
Sentence2: Bacteria can cause bodily tissues to swell.
[EX A]: bodily

[EX Q]: Sentence1: Light is all our eyes can really see. 
Sentence2: mirrors can be seen with our eyes.
[EX A]:
eyes