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.

[EX Q]: Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: items properties are the same as the materials the item is made of.
[EX A]: made

[EX Q]: Sentence1: Humans have collected and grown mushrooms for food for thousands of years. 
Sentence2: humans have collected and grown porcinis for thousands of years.
[EX A]: Humans

[EX Q]: Sentence1: when light enters the eye through the pupil , that light falls on the retina. 
Sentence2: Intermediate length rays are visible as light.
[EX A]:
light