sacculus vs sac

sacculus and sac both are nouns.

Word	Noun	Adjective	Verb	Adverb
sacculus	Yes	No	No	No
sac	Yes	No	No	No

As nouns, sac is a hypernym of sacculus; that is, sac is a word with a broader meaning than sacculus:

sacculus: a small sac or pouch (especially the smaller chamber of the membranous labyrinth)
sac: a structure resembling a bag in an animal

sacculus (noun)	sac (noun)
a small sac or pouch (especially the smaller chamber of the membranous labyrinth)	a structure resembling a bag in an animal
	a case or sheath especially a pollen sac or moss capsule
	an enclosed space