THESAURUS
Guarantee
Bible oath, and candle, arm, armor, assert under oath, assurance, assure, attest, avouch, avouchment, avow, back, bail, bailsman, be sponsor for, bless, bond, bondsman, book, certify, champion, cloak, compass about, confirm, copyright, countersecure, countersign, cover, cushion, defend, depone, depose, earnest, endorse, ensure, extrajudicial oath, faith, fence, fend, godfather, godparent, guarantor, guaranty, guard, harbor, haven, indemnity, insurance, insure, insurer, ironclad oath, judicial oath, keep, keep from harm, kiss the book, loyalty oath, mainpernor, make a promise, make certain, make safe, make sure, mortgagor, nestle, oath, oath of allegiance, oath of office, obligation, official oath, parole, patent, pledge, plight, police, promise, protect, register, ride shotgun for, safeguard, screen, secure, security, shelter, shield, shroud, sign, sign for, solemn declaration, solemn oath, sponsor, stand behind, stand up for, stocks and bonds, subscribe to, surety, swear, swear by bell, swear the truth, swear to, swear to God, swear to goodness, test oath, testify, tie, token, troth, undersign, undertake, undertaking, underwrite, underwriter, vouch, vouch for, vow, warrant, warrantor, warranty, word, word of honor
ROGET THESAURUS
Guarantee
Promise
N
promise, undertaking, word, troth, plight, pledge, parole, word of honor, vow, oath, profession, assurance, warranty, guarantee, insurance, obligation, contract, stipulation, engagement, preengagement, affiance, betroth, betrothal, betrothment, promising, promissory, votive, under hand and seal, upon oath, promised, affianced, pledged, bound, committed, compromised, in for it, as one's head shall answer for, in for a penny in for a pound, ex voto, gage d'amour.
VB
promise, give a promise, undertake, engage, make an engagement, form an engagement, enter into an engagement, enter on an engagement, bind oneself, tie oneself, pledge oneself, commit oneself, take upon oneself, vow, swear, give one's word, pass one's word, pledge one's word, plight one's word, give one's honor, pass one's honor, pledge one's honor, plight one's honor, give credit, pass credit, pledge credit, plight credit, give troth, pass troth, pledge troth, plight troth, betroth, plight faith, assure, warrant, guarantee, covenant, attest, hold out an expectation, contract an obligation, become bound to, become sponsor for, answer for, be answerable for, secure, give security, underwrite, adjure, administer an oath, put to one's oath, swear a witness.
Security
N
security, guaranty, guarantee, gage, warranty, bond, tie, pledge, plight, mortgage, collateral, debenture, hypothecation, bill of sale, lien, pawn, pignoration, real security, vadium, stake, deposit, earnest, handsel, caution, promissory note, bill, bill of exchange, I, O, U, personal security, covenant, specialty, parole, acceptance, indorsement, signature, execution, stamp, seal, sponsor, cosponsor, sponsion, sponsorship, surety, bail, mainpernor, hostage, godchild, godfather, godmother, recognizance, deed of indemnity, covenant of indemnity, authentication, verification, warrant, certificate, voucher, docket, doquet, record, probate, attested copy, receipt, acquittance, quittance, discharge, release, muniment, title deed, instrument, deed, deed poll, assurance, indenture, charter, charter poll, paper, parchment, settlement, will, testament, last will and testament, codicil, bonis avibus, gone where the woodbine twineth.
VB
give security, give bail, give substantial bail, go bail, pawn, impawn, spout, mortgage, hypothecate, impignorate, guarantee, warrant, warrantee, assure, accept, indorse, underwrite, insure, cosign, countersign, sponsor, cosponsor, execute, stamp, sign, seal, let, sett, grant a lease, take a lease, hold a lease, hold in pledge, lend on security.