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: when a river floods , that river deposits soil in flood plains. 
Sentence2: Hurricanes can cause local flooding, flash flooding, or coastal flooding.

SOLUTION: flood

PROBLEM: Sentence1: Protozoa make humans sick when they become human parasites. 
Sentence2: paramecium are single celled animals that make humans sick when they become human parasites.

SOLUTION: become

PROBLEM: Sentence1: Amphibians have sense organs to smell and taste chemicals. 
Sentence2: Frogs, toads, and salamanders have sense organs to smell and taste chemicals.

SOLUTION:
chemicals