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.
- obsessive-compulsive disorder
- obsessive-compulsive personality disorder
- obsessively
- obsessiveness
- obsessor
- obsidian
- obsolesce
- obsolescence
- obsolescent
- obsolescently
- obsolete
- obsoletely
- obsoleteness
- obsoletism
- obstacle
- obstacle course
- obstetric
- obstetrical
- obstetrically
- obstetrician
- obstetrics
- obstinacy
- obstinate
- obstinately
- obstinateness