public relations vs PR

public relations and PR both are nouns.

Word	Noun	Adjective	Verb	Adverb
public relations	Yes	No	No	No
PR	Yes	No	No	No

As nouns, public relations and PR are synonyms defined as:

public relations and PR: a promotion intended to create goodwill for a person or institution

public relations (noun)	PR (noun)
a promotion intended to create goodwill for a person or institution	a promotion intended to create goodwill for a person or institution
	a self-governing commonwealth associated with the United States occupying the island of Puerto Rico