superb adjective Excellent or outstanding in quality; of a very high standard. The chef prepared a superb meal that impressed every guest at the dinner. + superhero noun A fictional character with extraordinary powers who uses them to fight crime or evil. The boy dressed as his favorite superhero for the costume party. + supermarket noun A large, self-service store that sells food, drinks, and household goods. We stopped at the supermarket to buy groceries for the week. + supervise verb To watch over and direct the work or activities of a person or group. She was hired to supervise the new interns during their first month. + superior adjective Higher in quality, rank, or status compared to others. The new engine offers superior fuel efficiency compared to last year's model. + superficial adjective Existing or occurring only on the surface; lacking depth, thought, or seriousness. His knowledge of the subject turned out to be only superficial. + supersonic adjective Moving or capable of moving faster than the speed of sound. The fighter jet reached supersonic speed within seconds of takeoff. + superstition noun A belief that certain actions or objects bring good or bad luck, not based on reason or evidence. Many sailors held the superstition that whistling on board would summon a storm. + superstar noun An extremely famous and successful performer, athlete, or public figure. The concert sold out within minutes because of the superstar headlining it. + superpower noun A nation with great military, economic, and political influence over global affairs. The two superpowers competed for influence throughout the Cold War. + superlative adjective Of the highest quality or degree; excellent beyond comparison. The critics gave the young violinist superlative reviews after her debut. + supernatural adjective Relating to forces or events beyond what science or the laws of nature can explain. The old mansion was rumored to be haunted by supernatural spirits. + superimpose verb To place one image, layer, or idea on top of another so that both are visible or combined. The designer superimposed the logo onto the photograph of the building. + supersede verb To take the place of something, especially something older, outdated, or less effective. The new safety regulations superseded the guidelines written a decade earlier. + supervisor noun A person who oversees and directs the work of other employees or workers. She reported the broken equipment to her supervisor right away. + supernova noun A massive explosion that occurs when a dying star collapses and violently blows apart, briefly outshining a whole galaxy. Astronomers spotted a supernova in a distant galaxy through the telescope. + supersize verb To increase something, especially a food portion, to a much larger size than usual. He decided to supersize his order of fries for an extra dollar. + superstructure noun The part of a building, ship, or structure built above its foundation or main deck. Workers began erecting the superstructure once the foundation had set. + supervision noun The act of watching over and directing work, activities, or people to ensure they are done correctly. The interns worked under the close supervision of a senior researcher for the summer. + supercharge verb To greatly increase the power, speed, or effectiveness of something. The new marketing campaign supercharged sales within the first month. + superintendent noun A person who supervises or manages an organization, department, or building, such as a school district or police force. The new superintendent introduced several changes to the district's curriculum. + superhuman adjective Having or showing ability far beyond what is normally possible for a human being. It took superhuman effort for the climbers to reach the summit in the storm. + superglue noun A very strong, fast-acting adhesive that bonds materials almost instantly. He used superglue to fix the broken handle on the mug. + superhighway noun A wide, multi-lane highway designed for fast, long-distance travel. The superhighway connects the two cities in under two hours. + supersaturate verb To cause a solution to contain more dissolved substance than it normally could hold at a given temperature. Heating the water allowed the chemists to supersaturate it with sugar. + superconductor noun A material that conducts electricity with no resistance when cooled below a certain temperature. Superconductors are used in MRI machines to create powerful magnetic fields. +