adventurer vs lunatic

adventurer and lunatic both are nouns.

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

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

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

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