Sentence:  In those 18 years, <WSD>Gillette</WSD>, a small town in northeastern Wyoming, has changed from a group of houses and a railroad depot servicing a ranching and farming community to a mining boomtown, growing at a rate of 15 to 20 percent a year. 
Meaning of the word marked with <WSD> tags:  A city in Wyoming, USA, and the county seat of (Campbell County).