15-letter words containing s, i, l, a, k
- tamarisk gerbil — gerbil (def 2).
- thorndike's law — the principle that all learnt behaviour is regulated by rewards and punishments, proposed by Edward Lee Thorndike (1874–1949), US psychologist
- to call in sick — If you call in sick, you telephone the place where you work to tell them you will not be coming to work because you are ill.
- tokelau islands — a group of islands in the S Pacific Ocean belonging to New Zealand. 4 sq. mi. (10 sq. km).
- track athletics — sporting activities, such as relay running or sprinting, which take place on a running track
- 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.
- 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.
- 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