spear vs weapon system

spear and weapon system both are nouns.

Word	Noun	Adjective	Verb	Adverb
spear	Yes	No	Yes	No
weapon system	Yes	No	No	No

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

spear: a long pointed rod used as a tool or weapon
weapon system: any instrument or instrumentality used in fighting or hunting

Other hypernyms of spear include arm, weapon.

spear (noun)	weapon system (noun)
a long pointed rod used as a tool or weapon	any instrument or instrumentality used in fighting or hunting
an implement with a shaft and barbed point used for catching fish

spear (verb)	weapon system (verb)
pierce with a spear
thrust up like a spear