cashier vs doer

cashier and doer both are nouns.

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

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

cashier: a person responsible for receiving payments for goods and services (as in a shop or restaurant)
doer: a person who acts and gets things done

Other hypernyms of cashier include actor, worker.

cashier (noun)	doer (noun)
an employee of a bank who receives and pays out money	a person who acts and gets things done
a person responsible for receiving payments for goods and services (as in a shop or restaurant)

cashier (verb)	doer (verb)
discharge with dishonor, as in the army
discard or do away with