Yiddish vs High German language

Yiddish and High German language both are nouns.

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

As nouns, High German language is a hypernym of Yiddish; that is, High 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
High German language: the standard German language; developed historically from West Germanic

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

Yiddish (noun)	High 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