robot bomb vs flying bomb

robot bomb and flying bomb both are nouns.

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

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

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

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

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