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: Digestion is the process of breaking down food into components the body can absorb. 
Sentence2: Saliva starts to break down the food.
[EX A]: breaking

[EX Q]: Sentence1: rain causes erosion. 
Sentence2: Soil Erosion Soil erosion is what happens when soil is washed or blown away.
[EX A]: erosion

[EX Q]: Sentence1: Carbon monoxide is a gas produced by furnaces and other devices that burn fuel. 
Sentence2: The gas produced by furnaces and other devices that burn fuel is colorless and odorless gas.
[EX A]:
burn