Yiddish vs German language

Yiddish and German language both are nouns.

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

As nouns, German language is a hypernym of Yiddish; that is, German language is a word with a broader meaning than Yiddish:

Yiddish: a dialect of High German including some Hebrew and other words; spoken in Europe as a vernacular by many Jews; written in the Hebrew script
German language: the standard German language; developed historically from West Germanic

Other hypernyms of Yiddish include German, High German, High German language.

Yiddish (noun)	German language (noun)
a dialect of High German including some Hebrew and other words; spoken in Europe as a vernacular by many Jews; written in the Hebrew script	the standard German language; developed historically from West Germanic