WordNet sense 1 (a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process):

praseodymium

WordNet sense 2 (a self-governing commonwealth associated with the United States occupying the island of Puerto Rico):

Puerto Rico, Commonwealth of Puerto Rico, Porto Rico

WordNet sense 3 (a promotion intended to create goodwill for a person or institution):

public relations