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: If there is no movement friction is zero. 
Sentence2: Movement causes the temperature of an object to increase.

SOLUTION: movement

PROBLEM: Sentence1: Metabolic rate is the rate at which food is burned for energy. 
Sentence2: thyroid hormones increase the rate of energy consumption.

SOLUTION: energy

PROBLEM: Sentence1: When a wave is audible, it is called a sound wave . 
Sentence2: Telephones are used for communication by transmitting audible waves.

SOLUTION:
audible