bullet vs missile

bullet and missile both are nouns.

Word	Noun	Adjective	Verb	Adverb
bullet	Yes	No	No	No
missile	Yes	No	No	No

As nouns, missile is a hypernym of bullet; that is, missile is a word with a broader meaning than bullet:

bullet: a projectile that is fired from a gun
missile: a weapon that is forcibly thrown or projected at a targets but is not self-propelled

Other hypernyms of bullet include projectile.

bullet (noun)	missile (noun)
(baseball) a pitch thrown with maximum velocity	a weapon that is forcibly thrown or projected at a targets but is not self-propelled
a projectile that is fired from a gun	a rocket carrying a warhead of conventional or nuclear explosives; may be ballistic or directed by remote control
a high-speed passenger train