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 mold spore has a negative impact on the respiratory system. 
Sentence2: Major components of the respiratory system are the lungs, trachea, nose, and the cell.

system