untier vs doer

untier and doer both are nouns.

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

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

Other hypernyms of untier include actor, worker.

untier (noun)	doer (noun)
a person who unfastens or unwraps or opens	a person who acts and gets things done