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

Taiwan
noun: Chinese/Taiwanese (singular and plural)
adjective: Chinese/Taiwanese

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: Togolese

Tokelau
noun: Tokelauan(s)
adjective: Tokelauan

Tonga
noun: Tongan(s)
adjective: Tongan

Trinidad and Tobago
noun: Trinidadian(s), Tobagonian(s)
adjective: Trinidadian, Tobagonian

Tunisia
noun: Tunisian(s)
adjective: Tunisian

Turkey
noun: Turk(s)
adjective: Turkish

Turkmenistan
noun: Turkmen(s)
adjective: Turkmen

Turks and Caicos Islands
noun: none
adjective: none

Tuvalu
noun: Tuvaluan(s)
adjective: Tuvaluan

Uganda
noun: Ugandan(s)
adjective: Ugandan

Ukraine
noun: Ukrainian(s)
adjective: Ukrainian

United Arab Emirates
noun: Emirati(s)
adjective: Emirati

United Kingdom
noun: Briton(s), British (collective plural)
adjective: British

United States
noun: American(s)
adjective: American

Uruguay
noun: Uruguayan(s)
adjective: Uruguayan

Uzbekistan
noun: Uzbekistani
adjective: Uzbekistani

Vanuatu
noun: Ni-Vanuatu (singular and plural)
adjective: Ni-Vanuatu

Venezuela
noun: Venezuelan(s)
adjective: Venezuelan

Vietnam
noun: Vietnamese (singular and plural)
adjective: Vietnamese

Virgin Islands
noun: Virgin Islander(s)
adjective: Virgin Islander

Wallis and Futuna
noun: Wallisian(s), Futunan(s), or Wallis and
Futuna Islanders
adjective: Wall