Caricature

Caricature: A grotesque likeness of striking characteristics in persons or things.

Example:
" Col. Grangerford was very tall and very slim, and had a darkish-paly complexion, not a sign of red in it anywhere; he was clean-shaved every morning, all over his thin face, and he had the thinnest kind of lips , an the thinnest kind of nostrils, and a high nose, and heavy eyebrows, and the blackest kinds of eyes, sunk so deep back that they seemed like they was looking out of caverns at you, as you may say."
                                         (Huckleberry Finn, Pg.105)

This is an example of caricature because Huck is descrbing Col. Grangerford just the way he is. He might of exaggerated but he still described Col. Grangerford in a way that we can picture just the way he is.