A debugging device is a tool used to identify and fix errors in computer programs. The two crossword solutions for this term are 'REPELLENT' (9 letters) and 'SWATTER' (7 letters). A REPELLENT is a substance that is used to repel or drive away insects, while a swatter is a device used to swat or hit flying insects. Both of these devices can be used to debug computer programs by identifying and eliminating errors.