Gaelic language vs Erse

Gaelic language and Erse both are nouns.

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

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

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

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

Gaelic language (noun)	Erse (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