vow

appointment, arrangement, commitment, engagement, obligation

agreement, compact, contract, covenant

assurance, guarantee, guaranty, undertaking

bail, bond, deposit, gage, pawn, security, token, warranty

affiance, betroth, plight, troth

accede, agree, assent, consent

contract, engage, ensure, guarantee, undertake

affirm, assert, aver, avouch, avow, declare, insist, warrant