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: Mammalian predators include the coyote and bobcat. 
Sentence2: a coyote's teeth is important for digestion.

SOLUTION: coyote

PROBLEM: Sentence1: Humans have collected and grown mushrooms for food for thousands of years. 
Sentence2: Yeast and mushrooms are types of fungus.

SOLUTION: mushrooms

PROBLEM: Sentence1: Bioterrorism is another potential threat in the environment. 
Sentence2: Untitled Document Bioterrorism Bacillus anthracis spores are very hardy.

SOLUTION:
Bioterrorism