Holland vs Netherlands

Holland and Netherlands both are nouns.

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

As nouns, Holland and Netherlands are synonyms defined as:

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

Other synonyms of Holland include Nederland, The Netherlands.

Holland (noun)	Netherlands (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