Dictionary.com defines maniac as:
1. a raving or violently insane person; lunatic. 2. any intemperate or overly zealous or enthusiastic person: a maniac when it comes to details.It gives the origin as being from the Middle Latin maniacus of, pertaining to madness.
As Related Words it lists lunatic, madman, and maniacal.
A madman, An insane person
The definition of the Latin base word 'mania' is craziness or obsession, as in pyromania (an obsession with fire).
The maniac chased me home.
No, but it can be impolite to call someone a maniac.
That maniac committed a gruesome crime.
A maniac is "un / une maniaque" in French.
The word "unbeknownst" appears on page 22 of "Maniac Magee" by Jerry Spinelli.
The word "segregation" appears on page 87 of the book "Maniac Magee" by Jerry Spinelli.
The word "extra" contains the letter X in the book "Maniac Magee" by Jerry Spinelli.
The word "theory" appears on page 110 of the book "Maniac Magee" by Jerry Spinelli.
Maniac bibliomaniac
The word "rookie" can be found on page 19 of the book "Maniac Magee" by Jerry Spinelli.