Final answer:
Pyromania is defined as an excessive preoccupation with fire, differing from conditions such as hydrophobia, kleptomania, and paranoia.
Step-by-step explanation:
The excessive preoccupation with fire is termed pyromania. This is a psychiatric condition characterized by an impulse control disorder where the individual has an obsessive desire to start fires or fascination with fire. The other options listed, such as hydrophobia, kleptomania, and paranoia, refer to different conditions. Hydrophobia is an extreme or irrational fear of water, often associated with rabies; kleptomania is a recurrent urge to steal, typically without regard for need or profit; and paranoia is a thought process heavily influenced by anxiety or fear, often to the point of irrationality and delusion.