What is the verb in what do the words Puerto Rico mean?

There is no verb, but rico is an adverb. Puerto means port, or harbor, and rico means rich, abundant, or affluent. So Puerto Rico then would mean rich harbor. The ending of rico changes to an "a" rather than an "o" if the noun is female rather than male. For example, Costa Rica. By the way, costa means coast, shore, or seaside, or it can mean cost, but taking it into the context of the phrase, Costa Rica means rich coast. I hope this helps you :)