Usefulness is a quality that can be applied to many aspects of life. SERVICEABLENESS (15 letters) is the ability to provide assistance or aid, while CONVENIENCE (11 letters) is the state of being able to do something easily and quickly. APPLIANCE (9 letters) refers to a device or tool that is used to perform a specific task, while BENEFIT (7 letters) is an ADVANTAGE or gain that is derived from something. ADVANTAGE (9 letters) is a favorable or desirable circumstance, while APPLICATION (11 letters) is the act of putting something into practice. Ministration (12 letters) is the act of providing care or assistance, while SERVICEABILITY (14 letters) is the ability to be used or operated. ACCESSIBILITY (13 letters) is the quality of being able to be reached or entered, while HELP (4 letters) is the act of providing assistance. AVAIL (5 letters) is the act of making USE of something, while USE (3 letters) is the act of employing something for a particular purpose. EASE (4 letters) is the state of being comfortable or free from difficulty, while FITNESS (7 letters) is the quality of being suitable for a particular purpose. APPROPRIATENESS (15 letters) is the quality of being suitable for a particular situation, while COMFORT (7 letters) is the state of being free from discomfort or distress. VALUE (5 letters) is the WORTH of something in terms of money or importance, while WORTH (5 letters) is the VALUE of something in terms of money or importance. MILEAGE (7 letters) is the amount of USE or BENEFIT that is derived from something.