-nik Look up -nik at Dictionary.com
as in beatnik, etc., suffix used in word formation from c.1945, from Yiddish -nik (as in nudnik "a bore"), from Russian -nik, common personal suffix meaning "person or thing associated with or involved in" (compare nudnik; kolkhoznik "member of a kolkhoz"). Rocketed to popularity with sputnik (q.v.).