bomber vs doer

bomber and doer both are nouns.

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

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

Other hypernyms of bomber include actor, worker.

bomber (noun)	doer (noun)
a military aircraft that drops bombs during flight	a person who acts and gets things done
a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
a person who plants bombs