Nouns

(n)suretysomething clearly established
(n)security, suretyproperty that your creditor can claim in case you default on your obligation“bankers are reluctant to lend without good security”
(n)hostage, suretya prisoner who is held by one party to insure that another party will meet specified terms
(n)guarantor, surety, warrantor, warranterone who provides a warrant or guarantee to another
(n)security, suretya guarantee that an obligation will be met