finial

As a noun finial

is the knot or bunch of foliage, or foliated ornament, that forms the upper extremity of a pinnacle in gothic architecture.

As an adjective inial is

(anatomy) relating to the inion.

As nouns the difference between final and finial

is that final is a final examination; a test or examination given at the end of a term or class; the test that concludes a class while finial is the knot or bunch of foliage, or foliated ornament, that forms the upper extremity of a pinnacle in Gothic architecture.

As an adjective final

is last; ultimate.