maniac

As a noun maniac

is an insane person, especially one who suffers from a mania.

As an adjective frantic is

insane, mentally unstable.

As nouns the difference between maniac and psycho

is that maniac is an insane person, especially one who suffers from a mania while psycho is (pejorative|slang) a person who is psychotic or otherwise insane.

As an adjective psycho is

(colloquial|or|pejorative) psychotic, or otherwise insane.

As nouns the difference between sociopath and maniac

is that sociopath is a person with an antisocial personality disorder, exhibiting antisocial behavior that usually is the result of social and environmental factors in the person's early life while maniac is an insane person, especially one who suffers from a mania.

As nouns the difference between maniac and frenzy

is that maniac is an insane person, especially one who suffers from a mania while frenzy is a state of wild activity or panic.

As an adjective frenzy is

mad; frantic.

As a verb frenzy is

to render frantic.

As nouns the difference between megalomaniac and maniac

is that megalomaniac is one affected with or exhibiting megalomania while maniac is an insane person, especially one who suffers from a mania.

As a noun maniac

is an insane person, especially one who suffers from a mania.

As a verb table is

.

As nouns the difference between maniac and killer

is that maniac is an insane person, especially one who suffers from a mania while killer is that which kills.

As an adjective killer is

excellent, very good.

As nouns the difference between psychotic and maniac

is that psychotic is a person affected by psychosis while maniac is an insane person, especially one who suffers from a mania.

As an adjective psychotic

is of, related to, or suffering from psychosis.

As nouns the difference between maniac and madness

is that maniac is an insane person, especially one who suffers from a mania while madness is the state of being mad; insanity; mental disease.

As a noun maniac

is an insane person, especially one who suffers from a mania.

As a proper noun best is

.