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: Instead, the body is covered with a protective shell of bony armor. 
Sentence2: Most mollusks have protective of bony armor.
[EX A]: armor

[EX Q]: Sentence1: a light bulb is used for seeing in the dark. 
Sentence2: light is required for seeing.
[EX A]: seeing

[EX Q]: Sentence1: Deforestation happens when people cut down forests or when trees are burned. 
Sentence2: creating wood-free paper does not require deforestation.
[EX A]:
Deforestation