projectile vs weapon

projectile and weapon both are nouns.

Word	Noun	Adjective	Verb	Adverb
projectile	Yes	Yes	No	No
weapon	Yes	No	No	No

As nouns, weapon is a hypernym of projectile; that is, weapon is a word with a broader meaning than projectile:

projectile: a weapon that is forcibly thrown or projected at a targets but is not self-propelled
weapon: any instrument or instrumentality used in fighting or hunting

Other hypernyms of projectile include arm, weapon system.

projectile (noun)	weapon (noun)
a weapon that is forcibly thrown or projected at a targets but is not self-propelled	any instrument or instrumentality used in fighting or hunting
any vehicle self-propelled by a rocket engine	a means of persuading or arguing

projectile (adjective)	weapon (adjective)
impelling or impelled forward