A rock-hound is someone who has a passion for collecting rocks and minerals, but there are many different words that can be used to describe someone with this hobby. One synonym for rock-hound is a mineral enthusiast. This term emphasizes a deep interest in the scientific aspects of studying rocks and minerals. A rock collector is another commonly used term that denotes someone who collects rocks for their aesthetic or sentimental value. A lapidary is someone who not only collects rocks but also cuts and polishes them into jewelry or other objects. Finally, a geologist is someone who studies the earth and its formations, including rocks and minerals. All of these words describe different aspects of the rock-hounding hobby and the people who pursue it.