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.

[EX Q]: Sentence1: Cultivation is easier if soil is loose. 
Sentence2: soil with more oxygen is easier to cultivate.
[EX A]: Cultivation

[EX Q]: Sentence1: pathogens can cause disease. 
Sentence2: pathogens affects the immune system.
[EX A]: pathogens

[EX Q]: Sentence1: Water remains in the current of the river. 
Sentence2: A long tail helps an animal navigate through a river.
[EX A]:
river