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: For example, in salt water, salt is the solute and water is the solvent. 
Sentence2: Heating salty water causes the solvent to evaporate while the solute remains.

solvent