gamba vs viol

gamba and viol both are nouns.

Word	Noun	Adjective	Verb	Adverb
gamba	Yes	No	No	No
viol	Yes	No	No	No

As nouns, viol is a hypernym of gamba; that is, viol is a word with a broader meaning than gamba:

gamba: viol that is the bass member of the viol family with approximately the range of the cello
viol: any of a family of bowed stringed instruments that preceded the violin family

gamba (noun)	viol (noun)
viol that is the bass member of the viol family with approximately the range of the cello	any of a family of bowed stringed instruments that preceded the violin family