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: Potassium is an essential nutrient for plants and animals. 
Sentence2: Potassium is important for an animal to survive.

Potassium