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.

[Q]: Sentence1: a circle graph can be used to display percents. 
Sentence2: pie charts are circle graphs.
[A]: circle


[Q]: Sentence1: Earthquakes cause massive damage. 
Sentence2: tectonic plates being pushed together causes massive damage.
[A]: damage


[Q]: Sentence1: a switch is used to start the flow of current in an electrical circuit. 
Sentence2: A light turns on when the switch is open so the current can flow.
[A]:
current