aristocracy vs nobility

aristocracy and nobility both are nouns.

Word	Noun	Adjective	Verb	Adverb
aristocracy	Yes	No	No	No
nobility	Yes	No	No	No

As nouns, aristocracy and nobility are synonyms defined as:

aristocracy (noun)	nobility (noun)
a privileged class holding hereditary titles	the quality of elevation of mind and exaltation of character or ideals or conduct
the most powerful members of a society	a privileged class holding hereditary titles
	the state of being of noble birth