- workhorse - machine that performs dependably under heavy use; "the IBM main frame computers have been the workhorse of the business world"
--1 is a kind of machine
- workhorse - a horse used for plowing and hauling and other heavy labor
--2 is a kind of horse, Equus caballus
--2 has particulars:plow horse, plough horse; draft horse, draught horse, dray horse; packhorse; farm horse, dobbin - workhorse - a horse used for plowing and hauling and other heavy labor