Open English Wordnet
Nouns
(n)head, chief, top doga person who is in charge“the head of the whole operation” Adjectives
(s)chief, main, primary, principal, mastermost 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” 