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: Passive immunity lasts only as long as the antibodies survive in body fluids. 
Sentence2: Booster shots are needed after antibodies won't survive in body fluids.

antibodies