Gaelic language vs Erse language

Gaelic language and Erse language both are nouns.

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

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

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

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

Gaelic language (noun)	Erse language (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