SpongeTech dismissing their accountant does not have the severity of firing the accountant.
"Dismissed" is related to "fired" but it is not a synonym.
"Fire" means to dismiss from a job. Rather specific.
"Dismiss" has more subtle and softer meanings, such as allowing or giving permission to depart.
According to Random House Unabridged Dictionary:
dis·miss, v.t.
1. to direct (an assembly of persons) to disperse or go: I dismissed the class early.
2. to bid or allow (a person) to go; give permission or a request to depart.
3. to discharge or remove, as from office or service: to dismiss an employee.
4. to discard or reject: to dismiss a suitor.
5. to put off or away, esp. from consideration; put aside; reject: She dismissed the story as mere rumor.
6. to have done with (a subject) after summary treatment: After a perfunctory discussion, he dismissed the idea.
7. Law. to put out of court, as a complaint or appeal.
fire, n., v., fired, fir·ing.
-v.t.
31. to set on fire.
32. to supply with fuel; attend to the fire of: They fired the boiler.
33. to expose to the action of fire; subject to heat.
34. to apply heat to in a kiln for baking or glazing; burn.
35. to heat very slowly for the purpose of drying, as tea.
36. to inflame, as with passion; fill with ardor.
37. to inspire.
38. to light or cause to glow as if on fire.
39. to discharge (a gun).
40. to project (a bullet or the like) by or as if by discharging from a gun.
41. to subject to explosion or explosive force, as a mine.
42. to hurl; throw: to fire a stone through a window.
43. to dismiss from a job.
44. Vet. Med. to apply a heated iron to (the skin) in order to create a local inflammation of the superficial structures, with the intention of favorably affecting deeper inflammatory processes.
45. to drive out or away by or as by fire.