Lowlands of Scotland vs Scottish Lowlands

Lowlands of Scotland and Scottish Lowlands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lowlands of Scotland	Yes	No	No	No
Scottish Lowlands	Yes	No	No	No

As nouns, Lowlands of Scotland and Scottish Lowlands are synonyms defined as:

Lowlands of Scotland and Scottish Lowlands: the southern part of Scotland that is not mountainous

Other synonyms of Lowlands of Scotland include Lowlands.

Lowlands of Scotland (noun)	Scottish Lowlands (noun)
the southern part of Scotland that is not mountainous	the southern part of Scotland that is not mountainous