-nik /-ˌnɪk/ noun suffix
informal + often disapproving : a person connected to an activity, an organization, a movement, etc.
▪ a peacenik [=a person who is opposed to war] ▪ (US) a neatnik [=a very neat person]
▪ a peacenik [=a person who is opposed to war] ▪ (US) a neatnik [=a very neat person]
