Detailed Instructions: 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.
Q: Sentence1: Gaskets and thermal expansion increase the misalignment problem. 
Sentence2: Increasing heat in gaskets can increase misalignment problems.
A:
Gaskets