sword vs falchion

sword and falchion both are nouns.

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

As nouns, falchion is a hyponym of sword; that is, falchion 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
falchion: a short broad slightly convex medieval sword with a sharp point

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

sword (noun)	falchion (noun)
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard	a short broad slightly convex medieval sword with a sharp point