guarantor

[gar-uhn-tawr, -ter]
noun
1.
a person, group, system, etc., that guarantees.
2.
a person who makes or gives a guarantee, guaranty, warrant, etc.

Origin:
1850–55; guarant(ee) + -or2

preguarantor, noun
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World English Dictionary
guarantor (ˌɡærənˈtɔː)
 
n
a person who gives or is bound by a guarantee or guaranty; surety

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
One answer could be that the maths-heavy system is no longer a guarantor of
  social mobility.
The operator cannot be a guarantor of the accuracy of all posted information.
The government is the industry's largest shareholder and the guarantor of its
  liabilities.
In the old economic order, in the age of market share, volume growth was a
  guarantor of success.
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