Gaelic language vs Goidelic

Gaelic language and Goidelic both are nouns.

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

As nouns, Gaelic language and Goidelic are synonyms defined as:

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

Other synonyms of Gaelic language include Erse, Erse language, Gaelic, Goidelic language.

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