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: freezing means changing from a liquid into a solid by reducing heat energy. 
Sentence2: Water freezes into ice when cooled.
[EX A]: freezing

[EX Q]: Sentence1: mountains are formed by earthquakes. 
Sentence2: Mountains are formed by moving plates.
[EX A]: are

[EX Q]: Sentence1: Bile reduces the acidity of food entering from the highly acidic stomach. 
Sentence2: bile absorbs fats.
[EX A]:
Bile