Jutland vs Jylland

Jutland and Jylland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jutland	Yes	No	No	No
Jylland	Yes	No	No	No

As nouns, Jutland and Jylland are synonyms defined as:

Jutland and Jylland: peninsula in northern Europe that forms the continental part of Denmark and a northern part of Germany

Jutland (noun)	Jylland (noun)
an indecisive naval battle in World War I (1916); fought between the British and German fleets off the northwestern coast of Denmark	peninsula in northern Europe that forms the continental part of Denmark and a northern part of Germany
peninsula in northern Europe that forms the continental part of Denmark and a northern part of Germany