TASK DEFINITION: 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.
PROBLEM: Sentence1: dew is formed when water vapor condenses over night. 
Sentence2: dew is formed when cooling  over night.

SOLUTION: dew

PROBLEM: Sentence1: smell is used for finding food by some animals. 
Sentence2: Food includes small rodents and birds.

SOLUTION: food

PROBLEM: Sentence1: condensation is when change from a gas into a liquid by reducing heat energy. 
Sentence2: condensation is when change from a gas into a liquid by reducing kinetic energy.

SOLUTION:
change