15-letter words containing h, a, l, k
- thorndike's law — the principle that all learnt behaviour is regulated by rewards and punishments, proposed by Edward Lee Thorndike (1874–1949), US psychologist
- tidal benchmark — a benchmark used as a reference for tidal observations.
- track athletics — sporting activities, such as relay running or sprinting, which take place on a running track
- trickle charger — a small mains-operated battery charger, esp one that delivers less than 5 amperes and is used by car owners
- 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.
- 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.
- walking holiday — a holiday on which you walk a lot, esp in the countryside
- walnut husk fly — any of several fruit flies, as Rhagoletis completa, the larvae of which feed on and discolor walnut husks.
- watch the clock — If you are watching the clock, you keep looking to see what time it is, usually because you are bored by something and want it to end as soon as possible.
- white bear lake — a city in E Minnesota: summer resort.
- working holiday — trip combining vacation with job experience
- yorkshire dales — the valleys of the rivers flowing from the Pennines in W Yorkshire: chiefly Ribblesdale, Swaledale, Nidderdale, Wharfedale, and Wensleydale; tourist area