fanˈzine /-zēn/ noun

A magazine by and for amateur enthusiasts, esp of science fiction, pop music, or football

fan base noun

The fans of a team, person or thing, considered as a demographic group

fanˈboy noun (informal)

An obsessively enthusiastic fan of an element of popular culture, esp comic books or films

fan club noun

A group united by devotion to a celebrity

fan fiction noun

A style of fiction in which authors take the characters and setting of a favourite book, TV programme, etc and invent new plots and situations for them (short form fanˈfic)

fan mail noun

Letters from devotees to a celebrity

fan'site noun

A website devoted to fans of a particular celebrity, TV programme, etc.