Langue d'oc vs French language

Langue d'oc and French language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Langue d'oc	Yes	No	No	No
French language	Yes	No	No	No

As nouns, French language is a hypernym of Langue d'oc; that is, French language is a word with a broader meaning than Langue d'oc:

Langue d'oc: medieval provincial dialects of French formerly spoken in the south of France
French language: the Romance language spoken in France and in countries colonized by France

Other hypernyms of Langue d'oc include French.

Langue d'oc (noun)	French language (noun)
medieval provincial dialects of French formerly spoken in the south of France	the Romance language spoken in France and in countries colonized by France