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.
Input: Sentence1: a seismograph is used for measuring the size of an earthquake. 
Sentence2: A version of a simple pendulum is used to measure the size of an earthquake.

earthquake