S: (v) dominate, master (have dominance or the power to defeat over) "Her pain completely mastered her"; "The methods can master the problems"
S: (v) master, control (have a firm understanding or knowledge of; be on top of) "Do you control these data?"
Adjective
S: (adj) chief, main, primary, principal, master (most important element) "the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"