Annamese vs Vietnamese language

Annamese and Vietnamese language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Annamese	Yes	No	No	No
Vietnamese language	Yes	No	No	No

As nouns, Annamese and Vietnamese language are synonyms defined as:

Annamese and Vietnamese language: the Mon-Khmer language spoken in Vietnam

Other synonyms of Annamese include Annamese language, Annamite, Annamite language, Vietnamese.

Annamese (noun)	Vietnamese language (noun)
the Mon-Khmer language spoken in Vietnam	the Mon-Khmer language spoken in Vietnam
a native or inhabitant of Vietnam