Small, biting flies are a nuisance to humans and animals alike. Gnats, midges, and no-see-ums are all types of small, biting flies. Gnats are four-letter words that refer to any of various small, dipterous insects, especially those in the family Culicidae. MIDGE is a five-letter word for any of various small two-winged flies of the family Chironomidae, which includes many nonbiting forms. No-see-ums are seven-letter words for any of various small, two-winged flies of the family Ceratopogonidae, which includes many bloodsucking forms. All of these small, biting flies can be a nuisance to humans and animals alike.