fancier
ˈfansɪə
noun
a connoisseur or enthusiast of something, especially someone who has a special interest in or breeds a particular animal.
a pigeon fancier
enthusiast,devotee,hobbyist,lover,addict,fan,fanatic,expert,connoisseur,aficionado,breeder,buff,fiend,freak,bug,nut,maniac,junkie