saxhorn vs brass instrument

saxhorn and brass instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
saxhorn	Yes	No	No	No
brass instrument	Yes	No	No	No

As nouns, brass instrument is a hypernym of saxhorn; that is, brass instrument is a word with a broader meaning than saxhorn:

saxhorn: any of a family of brass wind instruments that resemble a bugle with valves
brass instrument: 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

Other hypernyms of saxhorn include brass.

saxhorn (noun)	brass instrument (noun)
any of a family of brass wind instruments that resemble a bugle with valves	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