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: heat can change the state of matter. 
Sentence2: Plasma, the fourth state of matter, can be created on earth by supplying sufficient heat.

matter