backsword vs sword

backsword and sword both are nouns.

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

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

backsword: a sword with only one cutting edge
sword: a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard

Other hypernyms of backsword include blade, brand, steel.

backsword (noun)	sword (noun)
a sword with only one cutting edge	a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
a stick used instead of a sword for fencing