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A fanatic (fan for short) is a person who is obsessed with something; a person who has a strong interest in something. Things that fanatics might be interested in are hobbies, sports (often a team), music, a kind of movie or book, or almost anything. There are lots of kinds of fanatics, including science fiction fans and fans of popular music stars, like The Beatles. Fanatics will meet with each other to talk about and share their interest.
The word fanatic can also be used to talk about people who care a lot about politics, religion or their own group of people. Some fanatics can hurt other people whom they dislike, or who disagree with them.
In British English, supporter is their word for a person who likes and supports a sportsperson or a team. Many teams of some sports have thousands of supporters, for example, the football team Real Madrid. In American English, supporter is more often used to talk about people in politics. Supporters of a politician, a political party, or an idea such as a particular law may like their subject very much, but usually are not violent.
