finial vs ornamentation

finial and ornamentation both are nouns.

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

As nouns, ornamentation is a hypernym of finial; that is, ornamentation 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
ornamentation: something used to beautify

Other hypernyms of finial include decoration, ornament.

finial (noun)	ornamentation (noun)
an ornament at the top of a spire or gable; usually a foliated fleur-de-lis	the act of adding extraneous decorations to something
	something used to beautify
	the state of being ornamented