Shetland sheep dog vs Shetland

Shetland sheep dog and Shetland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shetland sheep dog	Yes	No	No	No
Shetland	Yes	No	No	No

As nouns, Shetland sheep dog and Shetland are synonyms defined as:

Shetland sheep dog and Shetland: a small sheepdog resembling a collie that was developed in the Shetland Islands

Other synonyms of Shetland sheep dog include Shetland sheepdog.

Shetland sheep dog (noun)	Shetland (noun)
a small sheepdog resembling a collie that was developed in the Shetland Islands	a small sheepdog resembling a collie that was developed in the Shetland Islands
	an archipelago of about 100 islands in the North Atlantic off the north coast of Scotland