thrower vs doer

thrower and doer both are nouns.

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

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

thrower: someone who projects something (especially by a rapid motion of the arm)
doer: a person who acts and gets things done

Other hypernyms of thrower include actor, worker.

thrower (noun)	doer (noun)
someone who projects something (especially by a rapid motion of the arm)	a person who acts and gets things done
a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln
a person who twists silk or rayon filaments into a thread or yarn