TASK DEFINITION: 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.
PROBLEM: Sentence1: hunting requires seeing prey. 
Sentence2: hunting requires seeing an animal.

SOLUTION: hunting

PROBLEM: Sentence1: Asbestos is a dangerous carcinogen. 
Sentence2: Asbestos causes cancer.

SOLUTION: Asbestos

PROBLEM: Sentence1: Dilation occurs when cell walls relax. 
Sentence2: Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.

SOLUTION:
relax