embellishment vs ornamentation

embellishment and ornamentation both are nouns.

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

As nouns, embellishment and ornamentation are synonyms defined as:

embellishment and ornamentation: the act of adding extraneous decorations to something

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

Other hypernyms of embellishment include decoration, ornament.

embellishment (noun)	ornamentation (noun)
the act of adding extraneous decorations to something	the act of adding extraneous decorations to something
a superfluous ornament	something used to beautify
elaboration of an interpretation by the use of decorative (sometimes fictitious) detail	the state of being ornamented