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: Telephone Telephone calls are expensive. 
Sentence2: Communicating by transmitting sound is expensive.
[EX A]: expensive

[EX Q]: Sentence1: Also known as an cyclone , it is the opposite of an area of high pressure , or a anticyclone. 
Sentence2: Anticyclones cause clear weather.
[EX A]:
anticyclone