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: pathogens can cause disease. 
Sentence2: pathogens affects the immune system.
[A]: pathogens


[Q]: Sentence1: soil is formed by weathering. 
Sentence2: Something described as loamy is formed by weathering.
[A]: formed


[Q]: Sentence1: adding salt to a liquid decreases the melting point of that liquid. 
Sentence2: The melting point depends on the nature of the liquid.
[A]:
melting