As nouns the difference between through and vai
is that
through is a large slab of stone laid on a tomb while
vai is a verb animate intransitive: an intransitive verb that agrees with an animate subject.
As a preposition through
is from one side of an opening to the other.
As an adjective through
is passing from one side of an object to the other.
As an adverb through
is from one side to the other by way of the interior.
As a proper noun Vai is
an ethnic group of Liberia and Sierra Leone.