loved one vs doer

loved one and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
loved one	Yes	No	No	No
doer	Yes	No	No	No

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

Other hypernyms of loved one include actor, worker.

loved one (noun)	doer (noun)
a person who you love, usually a member of your family	a person who acts and gets things done