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: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.

A: protection
****
Q: Sentence1: Aquatic animals are adapted to living within certain salinity ranges. 
Sentence2: Animals adapted to living within certain salinity ranges require great amounts of water to survive.

A: adapted
****
Q: Sentence1: Bioterrorism is another potential threat in the environment. 
Sentence2: With mounting threats of bioterrorism, anthrax has become a rather frightening topic.

A:
Bioterrorism
****