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An adverb is a word that changes or qualifies the meaning of a verb, adjective, other adverb, clause, sentence or any other word or phrase, except that it does not include the adjectives and determiners that directly modify nouns. Adverbs are traditionally regarded as one of the parts of speech, although the wide variety of the functions performed by words classed as adverbs means that it is hard to treat them as a single uniform category.
Adverbs typically answer questions such as how?, in what way?, when?, where?, and to what extent?. This function is called the adverbial function, and is realized not just by single words (i.e., adverbs) but by adverbial phrases and adverbial clauses. http://en.wikipedia.org/wiki/Adverb 

A verb, from the Latin verbum meaning word, is a word (part of speech) that in syntax conveys an action (bring,read, walk, run, learn), an occurrence (happen, become), or a state of being (be, exist, stand). In the usual description of English, the basic form, with or without the particle to, is the infinitive. In many languages, verbs are inflected (modified in form) to encode tense, aspect, mood, and voice. A verb may also agree with theperson, gender, and/or number of some of its arguments, such as its subject, or object. In many languages, verbs have a present tense, to indicate that an action is being carried out; a past tense, to indicate that an action has been done; and a future tense, to indicate that an action will be done. http://en.wikipedia.org/wiki/Verb