Utility
Part of speech: noun
Definition: The state or condition of being useful; usefulness. Something that is useful. The ability of a commodity to satisfy needs or wants; the satisfaction experienced by the consumer of that commodity. A service provider, such as an electric company or water company or its securities. A software program specifically designed to help manage and tune the computer hardware, operating system or application software, and perform a single task or a small range of tasks; as opposed to application software which tend to be software suites.
Example sentence: I trust in nature for the stable laws of beauty and utility. Spring shall plant and autumn garner to the end of time.
Usefulness
Part of speech: noun
Definition: the quality of being useful, to which extent something is useful
Example sentence: The usefulness of religion - the fact that it gives life meaning, that it makes people feel good - is not an argument for the truth of any religious doctrine. It's not an argument that it's reasonable to believe that Jesus really was born of a virgin or that the Bible is the perfect word of the creator of the universe.