Holland vs Nederland

Holland and Nederland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holland	Yes	No	No	No
Nederland	Yes	No	No	No

As nouns, Holland and Nederland are synonyms defined as:

Holland and Nederland: a constitutional monarchy in western Europe on the North Sea; half the country lies below sea level

Other synonyms of Holland include Netherlands, The Netherlands.

Holland (noun)	Nederland (noun)
a constitutional monarchy in western Europe on the North Sea; half the country lies below sea level	a constitutional monarchy in western Europe on the North Sea; half the country lies below sea level