instruction:
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.
question:
Sentence1: Every photograph is produced by a camera. 
Sentence2: Photographers record images.
answer:
photograph


question:
Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.
answer:
moss


question:
Sentence1: animals require water for survival. 
Sentence2: Hydrogen and oxygen create water.
answer:

water