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: Coral reefs are made up of the accumulated exoskeletons of the coral polyp. 
Sentence2: coral polyps form reefs.

SOLUTION: polyp

PROBLEM: Sentence1: Light is the visible form of electromagnetic energy. 
Sentence2: Electromagnetic energy enters the eye through an opening called the pupil.

SOLUTION: electromagnetic

PROBLEM: Sentence1: when a body of water receives more water than it can hold , a flood occurs. 
Sentence2: Spores are washed into the field in flood water.

SOLUTION:
flood