Kirgiz vs Kirghiz language

Kirgiz and Kirghiz language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kirgiz	Yes	No	No	No
Kirghiz language	Yes	No	No	No

As nouns, Kirgiz and Kirghiz language are synonyms defined as:

Other synonyms of Kirgiz include Khirghiz, Khirghiz language, Kirghiz, Kirgiz language.

Kirgiz (noun)	Kirghiz language (noun)
the Turkic language spoken by the Kirghiz	the Turkic language spoken by the Kirghiz
a landlocked republic in west central Asia bordering on northwestern China; formerly an Asian soviet but became independent in 1991
a member of a people vast regions of central Siberia