baldhead vs doer

baldhead and doer both are nouns.

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

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

Other hypernyms of baldhead include actor, worker.

baldhead (noun)	doer (noun)
a person whose head is bald or shaved	a person who acts and gets things done