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.
Input: Sentence1: Light rays are focussed on the retina. 
Sentence2: When rays are shined at the eyes, they enter an opening called the pupil.

rays