sword vs weapon system

sword and weapon system both are nouns.

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

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

sword: a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
weapon system: any instrument or instrumentality used in fighting or hunting

Other hypernyms of sword include arm, weapon.

sword (noun)	weapon system (noun)
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard	any instrument or instrumentality used in fighting or hunting