hothead vs adventurer

hothead and adventurer both are nouns.

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

As nouns, adventurer is a hypernym of hothead; that is, adventurer is a word with a broader meaning than hothead:

Other hypernyms of hothead include venturer.

hothead (noun)	adventurer (noun)
a reckless impetuous irresponsible person	a person who enjoys taking risks
a belligerent grouch	someone who travels into little known regions (especially for some scientific purpose)