explorer vs doer

explorer and doer both are nouns.

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

As nouns, doer is a hypernym of explorer; that is, doer is a word with a broader meaning than explorer:

explorer: someone who travels into little known regions (especially for some scientific purpose)
doer: a person who acts and gets things done

Other hypernyms of explorer include actor, worker.

explorer (noun)	doer (noun)
someone who travels into little known regions (especially for some scientific purpose)	a person who acts and gets things done