gamba vs bass viol

gamba and bass viol both are nouns.

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

As nouns, gamba and bass viol are synonyms defined as:

gamba and bass viol: viol that is the bass member of the viol family with approximately the range of the cello

Other synonyms of gamba include viola da gamba.

gamba (noun)	bass viol (noun)
viol that is the bass member of the viol family with approximately the range of the cello	viol that is the bass member of the viol family with approximately the range of the cello
	largest and lowest member of the violin family