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: Cancer is a disease in which cells divide out of control. 
Sentence2: Cancer is a disease in which cells grow and divide rapidly.
[A]: Cancer


[Q]: Sentence1: Producers use energy and inorganic molecules to make food. 
Sentence2: Green plants use energy and inorganic molecules to make food.
[A]: energy


[Q]: Sentence1: Some precipitation that falls on land may soak into the ground, becoming groundwater. 
Sentence2: some rain that falls on land may soak into the ground, becoming groundwater.
[A]:
becoming