Available
Part of speech: adjective
Definition: Such as one may avail one's self of; capable of being used for the accomplishment of a purpose. Readily obtainable. Valid Having sufficient power, force, or efficacy to achieve the purpose; availing, effective.
Example sentence: A tremendous amount of needless pain and suffering can be eliminated by ensuring that health insurance is universally available.
Useable
Part of speech: adjective
Definition: that is able to be usedthat is fit to be used