chief

Synonyms: arch capital cardinal central champion consequential controlling crucial effective especial first foremost grand head highest key leading main major momentous number one outstanding paramount potent predominant preeminent premier primal primary prime principal ruling significant star stellar superior supreme telling uppermost vital weighty

Antonyms: inessential minor secondary subordinate unimportant unnecessary

Synonyms: big cheese big gun big wheel bigwig boss captain chieftain commander dictator director foreperson general governor head head honcho head person honcho key player leader manager monarch overlord overseer president principal proprietor ringleader ruler sovereign superintendent supervisor suzerain top brass top cat

Antonyms: apprentice employee servant subordinate underling worker