- ninja - a member of the ninja who were trained in martial arts and hired for espionage or sabotage or assassinations; a person skilled in ninjutsu
--1 is a kind of mercenary, soldier of fortune
--1 is a member of ninja- ninja - a class of 14th century Japanese who were trained in martial arts and were hired for espionage and assassinations
--2 is a kind of class, social class, socio-economic class
--2 has member: ninja - ninja - a class of 14th century Japanese who were trained in martial arts and were hired for espionage and assassinations