Maestro and Ninja

Maestro noun - A person with a high level of knowledge or skill in a field.

Ninja and maestro are semantically related. in ace topic. In some cases you can use "Ninja" instead a noun "Maestro". informal substitute

Ninja noun - A member of the ninja who were trained in martial arts and hired for espionage or sabotage or assassinations; a person skilled in ninjutsu.

Maestro and ninja are semantically related. Sometimes you can replace term "Maestro" with "Ninja", this nouns are similar.