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.
--------
Question: Sentence1: Water erosion has similar consequences as wind erosion. 
Sentence2: exposure to water can cause erosion.

Answer: Water


Question: Sentence1: boiling means change from a liquid into a gas by adding heat energy. 
Sentence2: boiling changes a liquid into steam.

Answer: liquid


Question: Sentence1: Chemical digestion occurs mainly in the small intestine. 
Sentence2: Chemical digestion and absorption of food occurs in the small intestine.

Answer:
Chemical