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: Flies are insects with two wings. 
Sentence2: Flies are arthropods with two wings.

SOLUTION: Flies

PROBLEM: Sentence1: Minerals are chemical elements that are essential for body processes. 
Sentence2: minerals are needed by body processes.

SOLUTION: processes

PROBLEM: Sentence1: hitting an object causes the particles in that object to vibrate. 
Sentence2: hitting an object causes Sounds.

SOLUTION:
an