Abuse-tic guitar - specially designed for rock musicians who like to bash the instruments on stage after a performance.

Amuse-tic guitar - the one that you play for fun.

Adieustic - the one that you just traded in for a new one.

Adiostic - the Spanish guitar you just traded in for a new one.

Acloistic - you play it all alone in a room where no one can hear you and it doesn't have any strings anyway, because you took a vow of silence.

Chewsick - made out of rawhide for your dog to chew on.