insaniac vs maniac

insaniac

noun

  • One who is insane and maniacal. 

adj

  • Insane and maniacal. 

maniac

noun

  • An insane person, especially one who suffers from a mania. 

  • A fanatic, a person with an obsession. 

How often have the words insaniac and maniac occurred in a corpus of books? (source: Google Ngram Viewer )