When it comes to finding synonyms for the phrase "raving lunatic", there are various options available that adequately describe an individual who behaves in a wild or irrational manner. Some of the synonyms include "crazed maniac", "berserk lunatic", "deranged lunatic", "frenzied lunatic", "mad lunatic", among others. All of these words depict an individual who has lost control of their faculties and is acting violently or erratically. It is essential to note that while these descriptions may be accurate, it's essential to avoid using derogatory language about mental illness, as it stigmatizes those who suffer from it and attracts unfair stereotypes.