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: a plant requires sunlight to grow. 
Sentence2: Grass needs air and sunlight.
[EX A]: sunlight

[EX Q]: Sentence1: Most people know that the Venus Flytrap is a carnivorous plant. 
Sentence2: The Venus Flytrap has specialized reproductive organs.
[EX A]: Flytrap

[EX Q]: Sentence1: riding a bike does not cause pollution. 
Sentence2: Carbon monoxide is, of course, an air pollutant.
[EX A]:
pollution