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: When algae dies, it uses oxygen to decompose. 
Sentence2: Oil comes from sediment mixing with dead, oxygenated algae.

dies