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.
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Question: Sentence1: pathogens can cause disease. 
Sentence2: pathogens affects the immune system.

Answer: pathogens


Question: Sentence1: when a hurricane moves over land , that hurricane will decrease in strength. 
Sentence2: Hurricanes form over the warm tropical water in ocean and die down when they move over land.

Answer: land


Question: Sentence1: Cnidarians are invertebrates such as jellyfish and corals. 
Sentence2: Invertebrates are animals without backbones.

Answer:
invertebrates