Merriam-Webster's Collegiate Dictionary:
workbag
workbasket
workbench
workboat
workbook
workbox
workday
worked
worked up
worker
worker-priest
workers' comp
workers' compensation
workfare
workfolk
workfolks
workforce
workhorse
workhouse
working
working asset
working capital
working class
working day
working dog
working fluid
working papers
working substance
working-class
workingman
workingwoman
workless
worklessness
workload
workman
workmanlike
workmanly
workmanship
workmate
workmen's compensation insurance
workout
workpeople
workpiece
workplace
workroom
workshop
workstation
worktable
workup
workweek
workwoman
world
world beat
world federalism
world federalist
world music
world power
world premiere
world series
world soul
world war
world wide web
world's fair
world-beater
world-class
world-shaking
world-weariness
world-weary
worldliness
worldling
worldly
worldly-minded
worldly-mindedness
worldly-wise
worldview
worldwide
worm
worm fence
worm gear
worm snake
worm wheel
worm's-eye
worm-eaten
wormer
wormhole
wormlike
worms
wormseed
wormwood
wormy
worn
worn-out
worriedly
worrier
worriment
worrisome
worrisomely
