Thesaurus.com
Dictionary.com
Definitions

aristocracy

[ar-uh-stok-ruh-see] / ˌær əˈstɒk rə si /
NOUN
privileged class, government
Synonyms
STRONGEST
elite gentility gentry nobility upper class upper crust
STRONG
noblesse patricians peerage society
WEAK
haut monde high society patriciate
Antonyms
WEAK
commoners plebites proletariat

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.