(n): something that is certain
(n): property that your creditor can claim in case you default on your obligation
(n): a possession whose ownership changes or lapses
(n): a prisoner who is held by one party to insure that another party will meet specified terms
(n): a person who is confined; especially a prisoner of war
(n): one who provides a warrant or guarantee to another
(n): someone who supports or champions something
(n): a guarantee that an obligation will be met
(n): a written assurance that some product or service will be provided or will meet certain specifications
This word reminds me of moiety.