bomber vs aeroplane

bomber and aeroplane both are nouns.

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

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

bomber: a military aircraft that drops bombs during flight
aeroplane: an aircraft that has a fixed wing and is powered by propellers or jets

Other hypernyms of bomber include airplane, plane, military plane, warplane.

bomber (noun)	aeroplane (noun)
a military aircraft that drops bombs during flight	an aircraft that has a fixed wing and is powered by propellers or jets
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