arch, big, capital, cardinal, central, chief, dominant, first, foremost, grand, great, highest, key, leading, main, master, number one(also No. 1), numero uno, overbearing, overmastering, overriding, paramount, predominant, preeminent, premier, primal, primary, principal, prior, sovereign(also sovran), supreme

distinguished, eminent, illustrious, noble, notable, noteworthy, outstanding, prestigious, signal, star, stellar, superiorhigh-level, senior, topimportant, influential, major, mighty, momentous, significantincomparable, matchless, unequaled(or unequalled), unparalleled, unsurpassedcelebrated, famed, famous, renowned

last, least

inconsequential, inconsiderable, insignificant, minor, negligible, slight, trifling, trivial, unimportantcollateral, inferior, secondary, subordinate, subsidiary