master

[1]	get the hang
[2]	overcome , get over , subdue , surmount
[3]	dominate
[4]	control

[1]	maestro , owner , head , chief , leader , chieftain , commander , lord , governor , director , controller , employer , manager , overseer , supervisor , superintendent , taskmaster , slave-driver , principal , sovereign , monarch , ruler , (Colloq) lord high muck-a-muck , Pooh-Bah , kingpin , big fish , boss , skipper , (Brit) gaffer , (US) king-fish , the man , big fish , big boss , bossman , (Slang) (US) big cheese , big wheel , Mr Big , chief/head honcho
[2]	expert , overlord , lord , authority , genius , craftsman , adept , maestro , mastermind , past master , old hand , virtuoso , ace , professional , (Colloq) pro , wizard , (Mainly Brit) dab hand , (US) crackerjack , (Slang) (US) maven/mavin
[3]	teacher , victor , superior , tutor , instructor , guide , leader , guru , swami
[4]	headmaster , schoolmaster
[5]	master copy , original
[6]	captain , sea captain , skipper
[7]	professional
[8]	passkey , passe-partout , master key

adj.

[1]	chief , main , primary , principal