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: Nitrogen is found in proteins, nucleic acids, and chlorophyll. 
Sentence2: Lawns eat nitrogen.

SOLUTION: Nitrogen

PROBLEM: Sentence1: Endospores are commonly found in soil and water. 
Sentence2: Dirt is really misplaced soil.

SOLUTION: soil

PROBLEM: Sentence1: Plants that are adapted to very dry environments are called xerophytes. 
Sentence2: Most cacti thrive in an area with very dry periods and light rainfall.

SOLUTION:
dry