Thailand vs Tai

Thailand and Tai both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thailand	Yes	No	No	No
Tai	Yes	Yes	No	No

Thailand (noun)	Tai (noun)
a country of southeastern Asia that extends southward along the Isthmus of Kra to the Malay Peninsula	the most widespread and best known of the Kadai family of languages
	a native or inhabitant of Thailand

Thailand (adjective)	Tai (adjective)
	of or relating to Thailand
	of or relating to the languages of the Thai people
	of or relating to or characteristic of Thailand or its people