sentimentalist vs doer

sentimentalist and doer both are nouns.

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

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

Other hypernyms of sentimentalist include actor, worker.

sentimentalist (noun)	doer (noun)
someone who indulges in excessive sentimentality	a person who acts and gets things done