This is quite incredible. Juan Osborne took the time to go through every script (season 1-5) on Lostpedia to find out how many words each character said (Jack - 28,591; Locke - 22,670) and how frequently they used certain words. Click here to see the full size version.
That’s not all though! This image is a web that includes Hurley, Kate, Sawyer, Sayid, Ben, Juliet & Desmond in addtion to Jack & Locke.
In both images, the bigger the word is, the more frequently that character used it.