worldling vs doer

worldling and doer both are nouns.

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

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

worldling: a person absorbed by the concerns and interests and pleasures of the present world
doer: a person who acts and gets things done

Other hypernyms of worldling include actor, worker.

worldling (noun)	doer (noun)
a person absorbed by the concerns and interests and pleasures of the present world	a person who acts and gets things done
an inhabitant of the earth