lunatic vs adventurer

lunatic and adventurer both are nouns.

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

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

Other hypernyms of lunatic include venturer.

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

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