15-letter words containing d, a, k, h
- the black death — a form of bubonic plague pandemic in Europe and Asia during the 14th century, when it killed over 50 million people
- thorndike's law — the principle that all learnt behaviour is regulated by rewards and punishments, proposed by Edward Lee Thorndike (1874–1949), US psychologist
- three of a kind — a set of three cards of the same denomination.
- tidal benchmark — a benchmark used as a reference for tidal observations.
- walking holiday — a holiday on which you walk a lot, esp in the countryside
- 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