Palau vs Republic of Palau

Palau and Republic of Palau both are nouns.

Word	Noun	Adjective	Verb	Adverb
Palau	Yes	No	No	No
Republic of Palau	Yes	No	No	No

As nouns, Palau and Republic of Palau are synonyms defined as:

Palau and Republic of Palau: a republic in the western central Pacific Ocean in association with the United States

Other synonyms of Palau include TT.

Palau (noun)	Republic of Palau (noun)
a republic in the western central Pacific Ocean in association with the United States	a republic in the western central Pacific Ocean in association with the United States
a chain of more than 200 islands about 400 miles long in the western central Pacific Ocean