work·a·hol·ic 
(wûr′kə-hôlĭk, -hŏlĭk)
(wûr′kə-hôlĭk, -hŏlĭk)n.
One who has a compulsive and unrelenting need to work.
worka·hol′ism n.
- microcap
- microcapsule
- microcephalic
- microcephalous
- microcephaly
- microchemical
- microchemist
- microchemistry
- microchip
- microcircuit
- microcircuitry
- microcirculation
- microcirculatory
- microclimate
- microclimatic
- microclimatologic
- microclimatological
- microclimatology
- microcline
- micrococcal
- micrococcus
- microcomputer
- microcopy
- microcosm
- microcosmic