sobersides vs doer

sobersides and doer both are nouns.

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

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

Other hypernyms of sobersides include actor, worker.

sobersides (noun)	doer (noun)
a serious and sedate individual	a person who acts and gets things done