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: condensing means changing from a gas into a liquid by reducing heat energy. 
Sentence2: Boiling is the change of state from liquid to gas, with condensation the reverse change.

gas