You can now buy many different commercial tapes to learn languages. Some even focus on the vocabulary itself. The advantage of learning vocabulary with tapes is that you hear them pronounce and you can use them while driving, jogging, cooking or other activities where reading is impossible. The disadvantage is that you cannot choose which words you wish to learn and have to deal with a rythm that is not set by you. Nothing, of course, prevents you from studying vocabulary with another technique as a complement.