flying bomb vs robot bomb

flying bomb and robot bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying bomb	Yes	No	No	No
robot bomb	Yes	No	No	No

As nouns, flying bomb and robot bomb are synonyms defined as:

flying bomb and robot bomb: a small jet-propelled winged missile that carries a bomb

Other synonyms of flying bomb include buzz bomb, doodlebug, V-1.

flying bomb (noun)	robot bomb (noun)
a small jet-propelled winged missile that carries a bomb	a small jet-propelled winged missile that carries a bomb