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: Most fungi get organic compounds from dead organisms. 
Sentence2: Moulds, yeasts, rusts, smuts, mildews, and mushrooms are all types of fungi.

A: fungi
****
Q: Sentence1: Antigens are molecules that the immune system recognizes as foreign to the body. 
Sentence2: An antibody binds to an antigen .

A:
Antigens
****