Puerto Rico vs PR

Puerto Rico and PR both are nouns.

Word	Noun	Adjective	Verb	Adverb
Puerto Rico	Yes	No	No	No
PR	Yes	No	No	No

As nouns, Puerto Rico and PR are synonyms defined as:

Puerto Rico and PR: a self-governing commonwealth associated with the United States occupying the island of Puerto Rico

Other synonyms of Puerto Rico include Commonwealth of Puerto Rico, Porto Rico.

Puerto Rico (noun)	PR (noun)
a self-governing commonwealth associated with the United States occupying the island of Puerto Rico	a promotion intended to create goodwill for a person or institution
the smallest and easternmost of the Greater Antilles in the Caribbean	a self-governing commonwealth associated with the United States occupying the island of Puerto Rico