Bass fiddle and Double-bass

Bass fiddle noun - Largest and lowest member of the violin family.

Double-bass and bass fiddle are semantically related. In some cases you can replace phrase "Double-bass" with "Bass fiddle", this phrases are similar.

Double-bass adjective - Pitched an octave below normal bass instrumental or vocal range.

Bass fiddle and double-bass are semantically related. You can use "Bass fiddle" instead a noun phrase "Double-bass".