With the prefix ad meaning toward or forward and the root "voc-" meaning to call 33387 we can understand that it is a advocate (noun) that is one who advocates (verb) for a person or cause by speaking in its favor.
With the prefix "ad-" meaning "toward" or "forward" and the root "voc-" meaning "to call," we can understand how an advocate (noun) is someone who advocates (verb) for a person or cause by speaking in its favor.