surety vs certainty

surety and certainty both are nouns.

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

As nouns, certainty is a hypernym of surety; that is, certainty is a word with a broader meaning than surety:

Other hypernyms of surety include foregone conclusion, sure thing.

surety (noun)	certainty (noun)
something clearly established	something that is certain
a guarantee that an obligation will be met	the state of being certain
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