Synonyms for key:
commodity, obsession, fulcrum, Underpinning, meat, Pass-key, principal, rekey, drag-and-drop, focal point, agenda, the gist, translation, master key, starter kit, requisite, necessary, basis, premier, fine print, tuning peg, type into, definition, skeleton, resonator, right-click, starter pack, type in, page up, fundamentals, foundation, big deal, nuance, key ring, punch-up, catgut, high point, the nitty-gritty, double-click, skeleton key, sacred cow, punch in, page down, plectrum, determinant, the quick, crowning glory, nub, need, centerpiece, open sesame, the leading edge, keynote, basics, treasure, latchkey, first principles, hover, nucleus, bolt, prerequisite, left-click, bottom line, sine qua non, damper, byway.
backspace, toggle, demand, priority, lifeblood, cornerstone, paramount, pith, consideration, pivotal, soft pedal, main, essence, imperative, requirement, primary, code, driver, foundation stone, answer, plank, bellows, drumstick, religion, control, necessity, leading, pivot, tap out, building block, prize, fret, foremost, explanation.
hammer, tab, string.
francis scott key
Francis Scott Key.
essential, important (adjective)
eternal, consequential, make-or-break, telling, historic, sacrosanct, substantial, all-important, serious, far-reaching, front and center, sacred, epoch-making, vitally, monumental, especial, high, valuable, hot, landmark, special, major league, mere, world-shaking, crucial, momentous, material, all-consuming, weighty, real.
Sense 2 (noun)
Sense 3 (noun)
Sense 4 (noun)
formula, control, route, backspace, secret.
Sense 5 (noun)
Sense 6 (noun)
Sense 8 (noun)
answer, solution (noun)
crest, token, flag, semaphore, insignia, logotype, stamp, pointer, icon, banner, ticket, wave, lighthouse, gesture, tag, label, prompt, gesticulation, guidepost, beacon, emblem, indication, denotation, symbol, hint, signal, marker, sign, motion, badge, designation, signpost, brand, wink, legend, notation, logo, figuration, alert, cue.
item that unlocks (noun)
describe, fundamental, operative, identify, distinguish, central, kilo, Francis Scott Key, significant, kilogram, of import, cay, key out, winder, cardinal, name, kg, Florida Keys, tonality, discover, primal, important.
key signature (noun)
Francis Scott Key.