ornamentation vs artefact

ornamentation and artefact both are nouns.

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

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

Other hypernyms of ornamentation include artifact.

ornamentation (noun)	artefact (noun)
the act of adding extraneous decorations to something	a man-made object taken as a whole
something used to beautify
the state of being ornamented