occlude vs occlusion

occlude is not a noun while occlusion is a noun.

Word	Noun	Adjective	Verb	Adverb
occlude	No	No	Yes	No
occlusion	Yes	No	No	No

occlude (noun)	occlusion (noun)
	the act of blocking
	an obstruction in a pipe or tube
	(dentistry) the normal spatial relation of the teeth when the jaws are closed
	(meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft
	closure or blockage (as of a blood vessel)

occlude (verb)	occlusion (verb)
block passage through