occlusion

As nouns the difference between thrombosis and occlusion

is that thrombosis is the formation of thrombi in the blood vessels of a living organism, causing obstruction of the circulation while occlusion is the process of occluding, or something that occludes.

As nouns the difference between occlusion and preocclusion

is that occlusion is the process of occluding, or something that occludes while preocclusion is the (phonological process, seen for example in Manx, of) insertion of a short stop before a sonorant, such as a [d] before an [n] or [l] (resulting in the preoccluded consonants [ᵈn] and [ᵈl]).

As an adjective preocclusion is

prior to occlusion.

As nouns the difference between occlusion and embolization

is that occlusion is the process of occluding, or something that occludes while embolization is a nonsurgical, minimally invasive procedure that effects the selective occlusion of blood vessels by purposely introducing emboli.