Buzzing Bug is a term used to describe a small insect that makes a buzzing sound. The two crossword solutions for the term are GNAT (4 letters) and DOR (3 letters). GNAT is an acronym for 'Gnats Not Aeroplanes Today' and is used to refer to any of the small, winged insects in the family Culicidae. DOR stands for 'Day-Old-Rising' and is used to describe a type of fly that rises from the ground in the morning.