V-1 vs robot bomb

V-1 and robot bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
V-1	Yes	No	No	No
robot bomb	Yes	No	No	No

As nouns, V-1 and robot bomb are synonyms defined as:

V-1 and robot bomb: a small jet-propelled winged missile that carries a bomb

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

V-1 (noun)	robot bomb (noun)
a small jet-propelled winged missile that carries a bomb	a small jet-propelled winged missile that carries a bomb