We don't have synonyms for alphorns yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are althorn, alphorn and althorns.
(n) :
(music) A long, curved, wooden horn used by mountain-dwelling herders in the Alps, originally to call cattle but now only as musical instrument in classical and folk tunes.
(n) :
(music) A long, curved, wooden horn used by mountain-dwelling herders in the Alps, originally to call cattle but now only as musical instrument in classical and folk tunes.