sword vs fencing sword

sword and fencing sword both are nouns.

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

As nouns, fencing sword is a hyponym of sword; that is, fencing sword 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
fencing sword: a sword used in the sport of fencing

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

sword (noun)	fencing sword (noun)
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard	a sword used in the sport of fencing