sword vs broadsword

sword and broadsword both are nouns.

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

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

sword: a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
broadsword: a sword with a broad blade and (usually) two cutting edges; used to cut rather than stab

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

sword (noun)	broadsword (noun)
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard	a sword with a broad blade and (usually) two cutting edges; used to cut rather than stab