steel vs backsword

steel and backsword both are nouns.

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

As nouns, backsword is a hyponym of steel; that is, backsword is a word with a more specific, narrower meaning than steel:

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

Other hyponyms of steel include broadsword, cavalry sword, saber, sabre, cutlas, cutlass, falchion, fencing sword, rapier, tuck.

steel (noun)	backsword (noun)
knife sharpener consisting of a ridged steel rod	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
an alloy of iron with small amounts of carbon; widely used in construction; mechanical properties can be varied over a wide range

steel (verb)	backsword (verb)
cover, plate, or edge with steel
get ready for something difficult or unpleasant