Icelandic language vs Icelandic

Icelandic language and Icelandic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Icelandic language	Yes	No	No	No
Icelandic	Yes	Yes	No	No

As nouns, Icelandic language and Icelandic are synonyms defined as:

Icelandic language and Icelandic: a Scandinavian language that is the official language of Iceland

Icelandic language (noun)	Icelandic (noun)
a Scandinavian language that is the official language of Iceland	a Scandinavian language that is the official language of Iceland

Icelandic language (adjective)	Icelandic (adjective)
	of or relating to Iceland or its people or culture and language