arabesque vs decoration

arabesque and decoration both are nouns.

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

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

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

Other hypernyms of arabesque include ornament, ornamentation.

arabesque (noun)	decoration (noun)
an ornament that interlaces simulated foliage in an intricate design	the act of decorating something (in the hope of making it more attractive)
position in which the dancer has one leg raised behind and arms outstretched in a conventional pose	something used to beautify
	an award for winning a championship or commemorating some other event