Tonga language vs Tonga

Tonga language and Tonga both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tonga language	Yes	No	No	No
Tonga	Yes	No	No	No

As nouns, Tonga language and Tonga are synonyms defined as:

Tonga language and Tonga: the language of the Tongan people of south central Africa (Zambia and Rhodesia)

Tonga language (noun)	Tonga (noun)
the language of the Tongan people of south central Africa (Zambia and Rhodesia)	the language of the Tongan people of south central Africa (Zambia and Rhodesia)
	a monarchy on a Polynesian archipelago in the South Pacific; achieved independence from the United Kingdom in 1970