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

A: Hermit
****
Q: Sentence1: friction causes the temperature of an object to increase. 
Sentence2: When we increase the temperature of objects, they always expand.

A: increase
****
Q: Sentence1: Adult tunicates are barrel-shaped. 
Sentence2: Tunicates differ strongly in appearance and are barrel shaped.

A:
barrel-shaped
****