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: Prokaryotes are single-celled organisms that lack a nucleus. 
Sentence2: Bacteria and archaebacteria are single-celled organisms that lack a nucleus.

lack