Saint Vincent and the Grenadines: noun: Saint Vincentian(s) or Vincentian(s)
adjective: Saint Vincentian or Vincentian
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