Synonyms of main

1 Syllable

head, arch, key, chief, fave, pipe, trench, keyer, piped, star

2 Syllables

prime, conduit, special, focal, stapler, ocean, wished-for, basic, archer, crucial, premier, bigshot, right-hand, oceans, lead-out, big-name, big-shot, stellar, channels, channel, central, downtowns, hookah, shoo-in, seaway, leading, chiefest, needful, downtown, leadout, kalian, major, fluting, world-class, midtown, righthand, vital, steller

3 Syllables

foxhole, principals, paramount, tideway, well-thought-of, cardinal, channeled, principal, supreme, essential, primary, dominant, outstanding, preeminent, controlling, waterway, prevailing, critical, capital, mainline, hundred-proof, bigtime, out-of-sight, foremost

4 Syllables

particular, overweighing, necessary, predominant, second-to-none, fundamental, overriding, out-of-this-world, favorite

5 Syllables

super-eminent, overbalancing, supereminent, constitutive