1 derivative, derived, indirect, resultant, resulting, second-hand
2 consequential, contingent, inferior, lesser, lower, minor, second-rate, subordinate, unimportant
3 alternate, auxiliary, backup, extra, fall-back, relief, reserve, second, subsidiary, supporting
Antonyms
cardinal, chief, head, larger, main, major, more important, only, original, preceding, primary, prime, principal, superior