is a specific kind of: instrument.

is a broader term that covers: ballistocardiograph, cardiograph | bronchoscope | cardiograph, electrocardiograph | dialysis machine, dialyzer | diathermy machine | electroencephalograph | electromyograph | endoscope | fiberscope | keratoscope | laryngoscope | ophthalmoscope | auriscope, auroscope, otoscope | polygraph | rhinoscope | speculum | stethoscope | surgical instrument | syringe | thermograph ... show more.