15-letter words containing o, t, l, i, h
- white corpuscle — white blood cell.
- whitley council — any of a number of organizations made up of representatives of employees and employers for joint consultation on and settlement of industrial relations and conditions for a particular industry or service
- wilson's thrush — veery.
- winter holidays — a period of rest from work or studies taken in winter
- withholding tax — that part of an employee's tax liability withheld by the employer from wages or salary and paid directly to the government.
- xylotypographic — involving or pertaining to xylotypography
- yellow goatfish — a schooling goatfish, Mulloidichthys martinicus, inhabiting the Atlantic Ocean from Florida to Panama.
- zoophysiologist — an expert in zoophysiology
- zoophytological — of or relating to zoophytology