admirer
 oxford
 views  updated May 29 2018ad·mir·er  / ədˈmī(ə)rər/ •
n. someone who has a particular regard for someone or something: he was a great admirer of Mark Twain. ∎  a man who is attracted to a particular woman or a woman who is attracted to a particular man: she's got a secret admirer.
 The Oxford Pocket Dictionary of Current English