Synonyms and related words :
advocate, allege in support, answer, argue for, assert, assure, attest, back, be sponsor for, bond, certify, champion, confirm, contend for, counter, countersecure, defend, endorse, ensure, espouse, guarantee, guaranty, insure, maintain, make a plea, plead for, rebut, refute, reply, respond, riposte, say in defense, secure, sign, sign for, speak for, speak up for, sponsor, stand behind, stick up for, subscribe to, support, sustain, undersign, underwrite, uphold, urge reasons for, warrant