: Qatari(s)

adjective: Qatari

Reunion:
noun: Reunionese (singular and plural)

adjective: Reunionese

Romania:
noun: Romanian(s)

adjective: Romanian

Russia:
noun: Russian(s)

adjective: Russian

Rwanda:
noun: Rwandan(s)

adjective: Rwandan

Saint Helena:
noun: Saint Helenian(s)

adjective: Saint Helenian

Saint Kitts and Nevis:
noun: Kittitian(s), Nevisian(s)

adjective: Kittitian, Nevisian

Saint Lucia:
noun: Saint Lucian(s)

adjective: Saint Lucian

Saint Pierre and Miquelon:
noun: Frenchman(men), Frenchwoman(women)

adjective: French

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

Senegal:
noun: Senegalese (singular and plural)

adjective: Senegalese

Seychelles:
noun: Seychellois (singular and plural)

adjective: Seychelles

Sierra Leone:
noun: Sierra Leonean(s)

adjective: Sierra Leonean

Singapore:
noun: Singaporean(s)

adjective: Singapore

Slovakia:
noun: Slovak(s)

adjective: Slovak

Slovenia:
noun: Slovene(s)

adjective: Slovenian

Solomon Islands:
noun: Solomon Islander(s)

adjective: Solomon Islander

Somalia:
noun: Somali(s)

adjective: Somali

South Africa:
noun: South African(s)

adjective: South African

Spain:
noun: Spaniard(s)

adjective: Spanish

Sri Lanka:
noun: Sri Lankan(s)

adjective: Sri Lankan

Sudan:
noun: Sudanese (singular and plural)

adjective: Sudanese

Suriname:
noun: Surinamer(s)

adjective: Surinamese

Swaziland:
noun: Swazi(s)

adjective: Swazi

Sweden:
noun: Swede(s)

adjective: Swedish

Switzerland:
noun: Swiss (singular and plural)

adjective: Swiss

Syria:
noun: Syrian(s)

adjective: Syrian

Tajikistan:
noun: Tajikistani(s)

adjective: Tajikistani

Tanzania:
noun: Tanzanian(s)

adjective: Tanzanian

Thailand:
noun: Thai (singular and plural)

adjective: Thai

Togo:
noun: Togolese (singular and plural)

adjective: Togol