madcap vs lunatic

madcap and lunatic both are nouns.

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

As nouns, madcap and lunatic are synonyms defined as:

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

madcap (noun)	lunatic (noun)
a reckless impetuous irresponsible person	an insane person
	a reckless impetuous irresponsible person

madcap (adjective)	lunatic (adjective)
characterized by undue haste and lack of thought or deliberation	insane and believed to be affected by the phases of the moon