explorer vs adventurer

explorer and adventurer both are nouns.

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

As nouns, explorer and adventurer are synonyms defined as:

explorer and adventurer: someone who travels into little known regions (especially for some scientific purpose)

explorer (noun)	adventurer (noun)
someone who travels into little known regions (especially for some scientific purpose)	a person who enjoys taking risks
	someone who travels into little known regions (especially for some scientific purpose)