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.

Ex Input:
Sentence1: Running water is better able to dissolve oxygen and nutrients than standing water. 
Sentence2: Oxygen and nutrients dissolve easily in rivers.

Ex Output:
dissolve


Ex Input:
Sentence1: Hermit crabs use the shells of dead snails for homes. 
Sentence2: Hermits crabs use dead snails shells as their place to live.

Ex Output:
Hermit


Ex Input:
Sentence1: Plants are multicellular eukaryotes with cell walls made of cellulose. 
Sentence2: For example, the walls of plant cells are made in large part of starch and cellulose .

Ex Output:

cell