madcap vs hotheaded

madcap is a noun but hotheaded is not a noun.

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

As adjectives, madcap and hotheaded are synonyms defined as:

madcap and hotheaded: characterized by undue haste and lack of thought or deliberation

Other synonyms of madcap include brainish, impetuous, impulsive, tearaway.

madcap (noun)	hotheaded (noun)
a reckless impetuous irresponsible person

madcap (adjective)	hotheaded (adjective)
characterized by undue haste and lack of thought or deliberation	quickly aroused to anger
	characterized by undue haste and lack of thought or deliberation