adventurer vs hothead

adventurer and hothead both are nouns.

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

As nouns, hothead is a hyponym of adventurer; that is, hothead is a word with a more specific, narrower meaning than adventurer:

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