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: Blood type is important for medical reasons. 
Sentence2: Type O is important for medical reasons.
[EX A]: important

[EX Q]: Sentence1: a switch is used to start the flow of current in an electrical circuit. 
Sentence2: The flow of electrical current powers a light bulb.
[EX A]: current

[EX Q]: Sentence1: wind and rain cause erosion. 
Sentence2: Abrasion is particle by particle erosion.
[EX A]:
erosion