finial vs ornament

finial and ornament both are nouns.

Word	Noun	Adjective	Verb	Adverb
finial	Yes	No	No	No
ornament	Yes	No	Yes	No

As nouns, ornament is a hypernym of finial; that is, ornament is a word with a broader meaning than finial:

finial: an ornament at the top of a spire or gable; usually a foliated fleur-de-lis
ornament: something used to beautify

Other hypernyms of finial include decoration, ornamentation.

finial (noun)	ornament (noun)
an ornament at the top of a spire or gable; usually a foliated fleur-de-lis	something used to beautify

finial (verb)	ornament (verb)
	make more attractive by adding ornament, colour, etc.
	be an ornament to