Nouns

(n)occlusionclosure or blockage (as of a blood vessel)
(n)occluded front, occlusion(meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft
(n)occlusion(dentistry) the normal spatial relation of the teeth when the jaws are closed
(n)blockage, block, closure, occlusion, stop, stoppagean obstruction in a pipe or tube“we had to call a plumber to clear out the blockage in the drainpipe”
(n)blockage, closure, occlusionthe act of blocking