Queen: the wife or widow of a king; a female monarch; a female chieftan; a woman of eminent rank, power, or attraction.
Princess: a woman having sovereign power; a female member of a royal family; the consort of a prince.
Duchess: the wife or widow of a duke; a woman who holds the rank of duke in her own right.
Countess: the wife or widow of a marquess; a woman who holds the rank of marquess in her own right.
Viscountess: the wife or widow of a viscount; a woman who holds the rank of viscount in her own right.
Baroness: the wife or widow of a baron; a woman who holds a baronial title in her own right.
Lady: a woman having rights or authority as a fuedal superior; a woman recieving the homage or devotion of a knight or lover.
Dame: a woman of rank, station, or authority; the wife or daughter of a lord; a female member of an order of knighthood.
Empress: the wife or widow of an emperor; a woman who is the sovereign or supreme monarch of an empire.