A parable is a particular type of teaching method that involves a comparison or use of analogy between two different things. It involves words, used to illustrate and instruct.
A miracle, on the other hand generally involves an action rather than just words. In relation to Jesus' miracles, for example, the miracle was performed to meet a need, often to heal a sick person. Of course, many of Jesus' miracles also illustrate and teach things about Jesus, especially His compassion and divine power, but they are primarily action rather than words. :)
