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 Q]: Sentence1: All sharks are predators. 
Sentence2: hiding can be used for avoiding sharks.
[EX A]: sharks

[EX Q]: Sentence1: Gravity is a force that pulls on things. 
Sentence2: A force that pulls on things pulls objects towards planets.
[EX A]: force

[EX Q]: Sentence1: when sound reaches the ear , that sound can be heard. 
Sentence2: Nevertheless, the sharpest sounds are perceived in the brain.
[EX A]:
sound