The term CITADEL RUSSIAN is composed of three words: DONAT (5 letters), PLEBE (5 letters), and COED (4 letters). DONAT is a Russian surname derived from the Latin word 'donatus, ' meaning 'GIVEN.' PLEBE is a term used to describe a freshman in the United States military academies. COED is an abbreviation for 'coeducational, ' which refers to educational institutions that accept both male and female students. Together, these three words form the term CITADEL RUSSIAN, which is used to describe a type of military academy in Russia that is open to both male and female students.