Common words:
* ensure - to make certain
* treasure - something of great value
* pleasure - a state of happiness or enjoyment
* pressure - the force exerted on a surface
* closure - the act of bringing something to an end
* exposure - the state of being open to something
* exposure - the state of being open to something
* exposure - the state of being open to something
* exposure - the state of being open to something
* exposure - the state of being open to something
Less common words:
* assure - to give confidence to someone
* co-assure - to guarantee something together
* countersure - a guarantee that is independent of another
* dissure - to discourage or dissuade
* foresure - certain or definite
* insure - to provide financial protection against loss
* misensure - to provide inadequate insurance
* oversure - excessively confident
* presure - to put pressure on someone
* reassure - to restore confidence in someone
* self-assure - to be confident in oneself
* seasure - a seizure or capture
* unsure - not certain or confident
Technical terms:
* seizure (in medical context) - a sudden episode of abnormal brain activity
* exposure (in photography) - the amount of light that reaches a film or sensor
* closure (in mathematics) - a property of a set
Remember that the suffix "-sure" can also be part of longer words, like "assurances" or "pleasures."