blade vs broadsword

blade and broadsword both are nouns.

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

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

blade: 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 blade include backsword, cavalry sword, saber, sabre, cutlas, cutlass, falchion, fencing sword, rapier, tuck.

blade (noun)	broadsword (noun)
the flat part of a tool or weapon that (usually) has a cutting edge	a sword with a broad blade and (usually) two cutting edges; used to cut rather than stab
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
flat surface that rotates and pushes against air or water
the part of the skate that slides on the ice
a broad flat body part (as of the shoulder or tongue)
a cut of beef from the shoulder blade
something long and thin resembling a blade of grass
a dashing young man
especially a leaf of grass or the broad portion of a leaf as distinct from the petiole