All of these people work as a team to create a comic book.
Writer – The writer writes the story and has the overall vision of how the story will go. They write the text and dialogue about how the story progresses.
Penciler – This person takes the initial script and hand draws the comic. They draw the comic in pencil which then gets inked and colored as the comic book develops.
Inker – The inker inks over the pencil version of the comic book. Sometimes this is done digitally but occasionally it is still done with actual ink.
Colorist – As the name implies, this person gives the comic color. This used to be done with colored ink but more often, this is now done digitally to allow for variants of different styles.
Letterer – The letterer will take the script and creates all the dialogue, word balloons, thought bubbles, and various written sound effects into the comic.
Editor – The comic book editor ensures that everything is perfect prior to publicaion of the comic book. They check for spelling mistakes, art problems, andd any other issues that need final attention prior to publication.