bull fiddle vs string bass

bull fiddle and string bass both are nouns.

Word	Noun	Adjective	Verb	Adverb
bull fiddle	Yes	No	No	No
string bass	Yes	No	No	No

As nouns, bull fiddle and string bass are synonyms defined as:

bull fiddle and string bass: largest and lowest member of the violin family

Other synonyms of bull fiddle include bass fiddle, bass viol, contrabass, double bass.

bull fiddle (noun)	string bass (noun)
largest and lowest member of the violin family	largest and lowest member of the violin family