sword vs weapon

sword and weapon both are nouns.

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

As nouns, weapon is a hypernym of sword; that is, weapon 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: any instrument or instrumentality used in fighting or hunting

Other hypernyms of sword include arm, weapon system.

sword (noun)	weapon (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
	a means of persuading or arguing