hothead vs lunatic

hothead and lunatic both are nouns.

Word	Noun	Adjective	Verb	Adverb
hothead	Yes	No	No	No
lunatic	Yes	Yes	No	No

As nouns, hothead and lunatic are synonyms defined as:

Other synonyms of hothead include daredevil, harum-scarum, madcap, swashbuckler.

hothead (noun)	lunatic (noun)
a reckless impetuous irresponsible person	an insane person
a belligerent grouch	a reckless impetuous irresponsible person

hothead (adjective)	lunatic (adjective)
	insane and believed to be affected by the phases of the moon