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: Modern Seismograph John Milne was the English seismologist and geologist who invented the first modern seismograph and promoted the building of seismological stations. 
Sentence2: An invention by John Milne is used for measuring the size of an earthquake.

invented