dive bomber vs bomber

dive bomber and bomber both are nouns.

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

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

dive bomber: a bomber that releases its bombs during a steep dive toward the target
bomber: a military aircraft that drops bombs during flight

dive bomber (noun)	bomber (noun)
a bomber that releases its bombs during a steep dive toward the target	a military aircraft that drops bombs during flight
	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