4
avouch(verb, state, maintain, declare, approve)
4
avow(verb, support, state, maintain, back)
4
back up(verb, expression, phrasal verb, support, maintain)
4
book
4
certificate(noun, verb, agreement, permit, recognize)
4
clinch(verb, state, maintain, secure, settle)
4
corroborate(verb, support, state, maintain, back)
4
cover(noun, verb, protect, bond, protection)
4
endorsement(noun, permit, security, warrant, seal)
4
engagement(noun, agreement, arrangement, need, contract)
4
finance(verb, support, help, set, promote)
4
guarantor
4
maintain(verb, support, state, favor, back)
4
ratify(verb, support, state, maintain, praise)
4
sanction(noun, verb, support, state, secure)
4
stand up for(verb, expression, idiom, phrasal verb, support)
4
substantiate(verb, support, maintain, back, declare)
4
troth(noun, pass, catch, assurance, commit)
4
uphold(verb, support, maintain, favor, back)
3
answer(noun, wave, greeting, nod, salutation)
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APASmart Define. (2015). guarantee thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/guarantee/thesaurus/synonyms
ChicagoSmart Define. 2015. "guarantee thesaurus" https://smartdefine.org/guarantee/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, guarantee thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/guarantee/thesaurus/synonyms>.
MLASmart Define. "guarantee thesaurus" 24 December 2015. Web. 23 September 2026. <https://smartdefine.org/guarantee/thesaurus/synonyms>