fencing sword vs saber

fencing sword and saber both are nouns.

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

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

Other hyponyms of fencing sword include epee, foil, sabre.

fencing sword (noun)	saber (noun)
a sword used in the sport of fencing	a stout sword with a curved blade and thick back
	a fencing sword with a v-shaped blade and a slightly curved handle

fencing sword (verb)	saber (verb)
	kill with a saber
	cut or injure with a saber