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: Endospores are commonly found in soil and water. 
Sentence2: Some bacteria form resistant cells called endospores.

SOLUTION: Endospores

PROBLEM: Sentence1: when a river floods , that river deposits soil in flood plains. 
Sentence2: when a river floods, it deposits soil in generally marshy areas.

SOLUTION: deposits

PROBLEM: Sentence1: harming an animal species has a negative impact on the population size of that species. 
Sentence2: Small animals are harmed by pesticides.

SOLUTION:
animal