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: bacteria can cause people to become ill. 
Sentence2: bacteria can cause people to die.

SOLUTION: bacteria

PROBLEM: Sentence1: Activation energy is required to overcome the energy barrier. 
Sentence2: All chemical reactions must first overcome the energy barrier.

SOLUTION:
barrier