arabesque vs ornament

arabesque and ornament both are nouns.

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

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

arabesque: an ornament that interlaces simulated foliage in an intricate design
ornament: something used to beautify

Other hypernyms of arabesque include decoration, ornamentation.

arabesque (noun)	ornament (noun)
an ornament that interlaces simulated foliage in an intricate design	something used to beautify
position in which the dancer has one leg raised behind and arms outstretched in a conventional pose

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