supplemental

Synonyms

accessory, appurtenant, auxiliary, peripheral, supplementary;

Antonyms

chief, main, principal;

Near Antonyms

basic, fundamental, primary, prime;

all-important, essential, imperative, indispensable, integral, necessary, needed, needful, required, requisite, vital;

Related Words

backup, makeshift, substitute;

added, additional, another, further;

complementary, contributory;

adjuvant, assistant, assisting, helping, supportive, tributary;

secondary, subordinate, subservient, subsidiary;

dispensable, excess, nonessential, superfluous, surplus, unessential;