Given the task definition and input, reply with output. 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.

Sentence1: when light enters the eye through the pupil , that light falls on the retina. 
Sentence2: Cones are coned shaped cells of the retina that respond to light.

retina