Irish language vs Goidelic

Irish language and Goidelic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish language	Yes	No	No	No
Goidelic	Yes	No	No	No

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

Irish language: the Celtic language of Ireland
Goidelic: any of several related languages of the Celts in Ireland and Scotland

Other hypernyms of Irish language include Erse, Erse language, Gaelic, Gaelic language, Goidelic language.

Irish language (noun)	Goidelic (noun)
the Celtic language of Ireland	any of several related languages of the Celts in Ireland and Scotland