hood ornament vs ornamentation

hood ornament and ornamentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hood ornament	Yes	No	No	No
ornamentation	Yes	No	No	No

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

hood ornament: an ornament on the front of the hood of a car emblematic of the manufacturer
ornamentation: something used to beautify

Other hypernyms of hood ornament include decoration, ornament.

hood ornament (noun)	ornamentation (noun)
an ornament on the front of the hood of a car emblematic of the manufacturer	the act of adding extraneous decorations to something
	something used to beautify
	the state of being ornamented