specialized russian

• специализи́рованный

  specialized, specialised

• мелкоте́мье

  concentration on narrow subjects, narrow specialization, prevalence of highly-specialized research

• кварти́рник

  thief (specialized on stealing from apartments)

Examples

• Э́тот психиа́тр специализи́ровался на расстро́йствах приема пищи.That psychiatrist specialized in eating disorders.