Samoa
noun: Samoan(s)
adjective: Samoan
San Marino
noun: Sammarinese (singular and plural)
adjective: Sammarinese
Sao Tome and Principe
noun: Sao Tomean(s)
adjective: Sao Tomean
Saudi Arabia
noun: Saudi(s)
adjective: Saudi or Saudi Arabian
Senegal
noun: Senegalese (singular and plural)
adjective: Senegalese
Serbia and Montenegro
noun: Serb(s); Montenegrin(s)
adjective: Serbian; Montenegrin
Seychelles
noun: Seychellois (singular and plural)
adjective: Seychellois
Sierra Leone
noun: Sierra Leonean(s)
adjective: Sierra Leonean
Singapore
noun: Singaporean(s)
adjective: Singapore
Slovakia
noun: Slovak(s)
adjective: Slovak