believer [believers](person who believes) noun [UK: bɪ.ˈliː.və(r)] [US: bə.ˈliː.vər]
neveriacinoun {m}
atheist [atheists](a person who rejects belief that any deities exist, whether or not that person believes that deities do not exist) noun [UK: ˈeɪ.θiɪst] [US: ˈeɪ.θiəst]