horn vs brass instrument

horn and brass instrument both are nouns.

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

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

horn: a brass musical instrument consisting of a conical tube that is coiled into a spiral and played by means of 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 horn include brass.

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

horn: a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of 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 horn include brass.

horn (noun)	brass instrument (noun)
one of the bony outgrowths on the heads of certain ungulates	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
any hard protuberance from the head of an organism that is similar to or suggestive of a horn
a brass musical instrument consisting of a conical tube that is coiled into a spiral and played by means of valves
a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves
an alarm device that makes a loud warning sound
a high pommel of a Western saddle (usually metal covered with leather)
a device on an automobile for making a warning noise
a noisemaker (as at parties or games) that makes a loud noise when you blow through it
a device having the shape of a horn
a noise made by the driver of an automobile to give warning
the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails

horn (verb)	brass instrument (verb)
stab or pierce with a horn or tusk