Bass horn and Brass instrument

Bass horn noun - The lowest brass wind instrument.

Brass instrument and bass horn are semantically related. In some cases you can use "Brass instrument" instead a noun phrase "Bass horn".

Brass instrument noun - A wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece.

Bass horn and brass instrument are semantically related. Sometimes you can replace phrase "Bass horn" with "Brass instrument", this phrases are similar.