A person who is adept at overseeing the construction a building using the plans drawn by an architect

Archaic form of quartermaster.

(archaic) One who teaches or practices artificial postures of the body: an acrobat.

plural of master race

A piece of exercise equipment used to tone the thighs, especially aimed at women.

plural of Master Cube

Rubik's Revenge

One who has an extremely high level of ability or knowledge within an area of achievement or expertise. / (Freemasonry) Someone who has previously been a master at a given lodge.

(UK, US, law) An authority appointed by a judge to make sure that judicial orders are actually followed.

plural of master plan