1. Usually 2. Urban 3. Unite 4. Union 5. UFO 6. Ugly 7. Unhappy 8. Unbelievable 9. Udder 10. Ukase 11. Ukulele 12. Ulcer 13. Ulcerate 14. Ulm 15. Ulster Each term is listed below with a brief explanation: 1. Usually: An adverb indicating something that happens frequently or habitually. 2. Urban: Referring to characteristics of a city or city life. 3. Unite: To join together or come together as one. 4. Union: A term used for a group of people or things joined together. 5. UFO: An acronym for "Unidentified Flying Object," typically referring to a mysterious aircraft reported in the sky. 6. Ugly: Describes something that is unattractive or unsightly. 7. Unhappy: Expresses a state of dissatisfaction or sadness. 8. Unbelievable: Describes something that is difficult to believe. 9. Udder: The mammary gland of an animal, such as a cow or a sheep. 10. Ukase: A Russian term for an edict or decree issued by a government authority. 11. Ukulele: A small, four-stringed musical instrument originating from Hawaii. 12. Ulcer: A sore that forms on the skin or mucous membranes due to erosion of the tissue. 13. Ulcerate: To form ulcers or to cause the erosion of tissue. 14. Ulm: A city in Germany. 15. Ulster: A type of loose-fitting, knee-length overcoat typically worn over a suit.