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: cold fronts cause thunderstorms as they pass by. 
Sentence2: Thunderstorms create havoc.

SOLUTION: thunderstorms

PROBLEM: Sentence1: if a neutral atom loses an electron then an atom with a negative charge will be formed. 
Sentence2: Ice crystals that are formed have a negative charge.

SOLUTION: charge

PROBLEM: Sentence1: Absorption of nutrients occurs mainly in the small intestine. 
Sentence2: Most foods contain several nutrients.

SOLUTION:
nutrients