con·trast

– verb
1. to compare in order to show unlikeness or differences; note the opposite natures, purposes, etc., of.
2. to exhibit unlikeness on comparison with something else.
3. to differ in a way that can serve to distinguish meanings.
– noun
4. a striking exhibition of unlikeness.
5. a person or thing that is strikingly unlike in comparison.
6. opposition or juxtaposition of different forms, lines, or colors in a work of art to intensify each element's properties and produce a more dynamic expressiveness.
7. the relative difference between light and dark areas of a print or negative.
8. the brightness ratio of the lightest to the darkest part of the television screen image.
9. a difference between linguistic elements, esp. sounds, that can serve to distinguish meanings.

sil·hou·ette

– noun
1. a two-dimensional representation of the outline of an object, as a cutout or configurational drawing, uniformly filled in with black, esp. a black-paper, miniature cutout of the outlines of a famous person's face.
2. the outline or general shape of something.
3. a dark image outlined against a lighter background.