High German language vs High German

High German language and High German both are nouns.

Word	Noun	Adjective	Verb	Adverb
High German language	Yes	No	No	No
High German	Yes	No	No	No

As nouns, High German language and High German are synonyms defined as:

High German language and High German: the standard German language; developed historically from West Germanic

Other synonyms of High German language include German, German language.

High German language (noun)	High German (noun)
the standard German language; developed historically from West Germanic	the standard German language; developed historically from West Germanic