Part 1. 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.
Part 2. Example
Sentence1: pesticides cause pollution. 
Sentence2: pollution can harm animals.
Answer: pollution.
Explanation: The word "pollution" is common to Sentence1 and Sentence2. So, it's a good answer.
Part 3. Exercise
Sentence1: Kinetic energy varies as the square of the speed of a moving body. 
Sentence2: Applying force in the direction of travel of a moving object will increase its kinetic energy.
Answer:
Kinetic