hostage vs surety

hostage and surety both are nouns.

Word	Noun	Adjective	Verb	Adverb
hostage	Yes	No	No	No
surety	Yes	No	No	No

As nouns, hostage and surety are synonyms defined as:

hostage and surety: a prisoner who is held by one party to insure that another party will meet specified terms

hostage (noun)	surety (noun)
a prisoner who is held by one party to insure that another party will meet specified terms	something clearly established
	a guarantee that an obligation will be met
	one who provides a warrant or guarantee to another
	a prisoner who is held by one party to insure that another party will meet specified terms
	property that your creditor can claim in case you default on your obligation