Tai vs Siamese

Tai and Siamese both are nouns.

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

As adjectives, Tai and Siamese are synonyms defined as:

Other synonyms of Tai include Thai.

As adjectives, Tai and Siamese are synonyms defined as:

Other synonyms of Tai include Thai.

As adjectives, Tai and Siamese are synonyms defined as:

Tai and Siamese: of or relating to or characteristic of Thailand or its people

Other synonyms of Tai include Thai.

As nouns, Siamese is a hyponym of Tai; that is, Siamese is a word with a more specific, narrower meaning than Tai:

Tai: the most widespread and best known of the Kadai family of languages
Siamese: a branch of the Tai languages, spoken in central Thailand, centered in Bangkok

As nouns, Tai and Siamese are synonyms defined as:

Other synonyms of Tai include Thai.

Tai (noun)	Siamese (noun)
the most widespread and best known of the Kadai family of languages	a slender short-haired blue-eyed breed of cat having a pale coat with dark ears paws face and tail tip
a native or inhabitant of Thailand	a branch of the Tai languages, spoken in central Thailand, centered in Bangkok
	a native or inhabitant of Thailand

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