master

nouns

an artist of consummate skill
"a master of the violin"; "one of the old masters"
maestro, master
is derived from
masterly
is derived from
mastership
a person who has general authority over others
lord, master, overlord
is derived from
mastership
a combatant who is able to defeat rivals
master, superior, victor
directs the work of others
master
is derived from
mastership
is a type of (narrower)
a person or firm that employs workers
employer
presiding officer of a school
headmaster, master, schoolmaster
is derived from
mastership
an original creation (i.e., an audio recording) from which copies can be made
master, master copy, original
an officer who is licensed to command a merchant ship
captain, master, sea captain, skipper
is derived from
mastership
someone who holds a master's degree from academic institution
master
is a type of (narrower)
a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
bookman, scholar, scholarly person, student
an authority qualified to teach apprentices
master, professional
is derived from
masterly
is derived from
mastership
key that secures entrance everywhere
master, master key, passe-partout, passkey

verbs

be or become completely proficient or skilled in
"She mastered Japanese in less than two years"
get the hang, master
is derived from
mastery
is derived from
mastering
get on top of; deal with successfully
"He overcame his shyness"
get over, master, overcome, subdue, surmount
have dominance or the power to defeat over
"Her pain completely mastered her"; "The methods can master the problems"
dominate, master
is derived from
mastery
is derived from
mastery
have a firm understanding or knowledge of; be on top of
"Do you control these data?"
control, master

adjectives

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"
chief, main, master, primary, principal