15-letter words containing s, i, l, k
- travel sickness — nausea caused by motion
- turk's-cap lily — either of two lilies, Lilum martagon or L. superbum, having nodding flowers with the perianth segments rolled backward.
- turkish delight — a candy made of fruit juice and gelatin, cubed and dusted with sugar.
- unalaska island — a large volcanic island in SW Alaska, in the Aleutian Islands. Length: 120 km (75 miles). Greatest width: about 40 km (25 miles)
- unchristianlike — not like a Christian; not in accordance with Christian teaching and values
- universal chuck — a chuck, as on a lathe headstock, having three stepped jaws moving simultaneously for precise centering of a workpiece of any of a wide range of sizes.
- unknown soldier — an unidentified soldier killed in battle and buried with honors, the tomb serving as a memorial to all the unidentified dead of a nation's armed forces. The tomb of the American Unknown Soldier, commemorating a serviceman killed in World War I, was established in the Arlington National Cemetery in Virginia in 1921. In 1958, the remains of personnel of World War II and the Korean War were buried alongside the tomb (now called the Tomb of the Unknowns, ). In 1984, a serviceman of the Vietnam War was interred next to the others.
- unskilled labor — work that requires practically no training or experience for its adequate or competent performance.
- unsportsmanlike — a man who engages in sports, especially in some open-air sport, as hunting, fishing, racing, etc.
- unstatesmanlike — not resembling or befitting a political leader whose wisdom, integrity, etc win great respect
- walking catfish — an Asian catfish, Clarias batrachus, that can survive out of water and move overland from one body of water to another: introduced into Florida.
- yorke peninsula — a peninsula in S Australia between Spencer Gulf and the Gulf of St. Vincent. 160 miles (257 km) long and 20–35 miles (32–56 km) wide.
- yorkshire dales — the valleys of the rivers flowing from the Pennines in W Yorkshire: chiefly Ribblesdale, Swaledale, Nidderdale, Wharfedale, and Wensleydale; tourist area