1) Annuls 2) Empty areas 3) Empty spaces 4) Invalidates 5) Makes invalid 6) Makes noncashable 7) Makes uncashable 8) Makes worthless 9) Nullifes 10) Nullifies 11) Renders null 12) Spaces between galaxies 13) Suits you can trump 14) Throws out 1) Annuls 2) Gaps 
Big regions of empty space found amidst galaxy clusters and superclusters.
A term generally applied to paints to describe holidays, holes, and skips in a film. Also used to describe shrinkage in castings and weld.
Pockets of air within a compacted coated or readymix material that may or may not be accessed by water.
voids 1. Spaces with nothing in them. 2. A series of bodily excretions. Related 'empty' word units: ceno-; vacu-.