| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blowfly | (noun) large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds | Synonyms: blow fly |
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| botfly | (noun) stout-bodied hairy dipterous fly whose larvae are parasites on humans and other mammals | - |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| catchfly | (noun) mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone | Synonyms: lychnis |
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| (noun) any plant of the genus Silene | Synonyms: campion, silene |
| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| damselfly | (noun) slender non-stinging insect similar to but smaller than the dragonfly but having wings folded when at rest | - |
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| dayfly | (noun) slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days | Synonyms: mayfly, shadfly |
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| dobsonfly | (noun) large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait | Synonyms: Corydalus cornutus, dobson, dobson fly |
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| dragonfly | (noun) slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc. | Synonyms: darning needle, devil's darning needle, mosquito hawk, sewing needle, skeeter hawk, snake doctor, snake feeder |
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| firefly | (noun) nocturnal beetle common in warm regions having luminescent abdominal organs | Synonyms: lightning bug |
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| (noun) tropical American click beetle having bright luminous spots | Synonyms: fire beetle, Pyrophorus noctiluca |
| fly | (noun) (baseball) a hit that flies up in the air | Synonyms: fly ball |
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| (noun) two-winged insects characterized by active flight | - |
| (noun) an opening in a garment that is closed by a zipper or by buttons concealed under a fold of cloth | Synonyms: fly front |
| (noun) flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent | Synonyms: fly sheet, rainfly, tent-fly, tent flap |
| (noun) fisherman's lure consisting of a fishhook decorated to look like an insect | - |
| flybridge | (noun) the highest navigational bridge on a ship; a small (often open) deck above the pilot house | Synonyms: fly bridge, flying bridge, monkey bridge |
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| flycatcher | (noun) any of a large group of small songbirds that feed on insects taken on the wing | Synonyms: Old World flycatcher, true flycatcher |
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| (noun) large American birds that characteristically catch insects on the wing | Synonyms: New World flycatcher, tyrant bird, tyrant flycatcher |
| flyer | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, circular, flier, handbill, throwaway |
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| (noun) someone who travels by air | Synonyms: flier |
| (noun) someone who operates an aircraft | Synonyms: aeronaut, aviator, flier |
| flying | (noun) an instance of traveling by air | Synonyms: flight |
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| flyleaf | (noun) a blank leaf in the front or back of a book | - |
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| flyover | (noun) a flight at a low altitude (usually of military aircraft) over spectators on the ground | Synonyms: fly-by, flypast |
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| (noun) bridge formed by the upper level of a crossing of two highways at different levels | Synonyms: overpass |
| flypaper | (noun) paper that is poisoned or coated with a sticky substance to kill flies | - |
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| flypast | (noun) a flight at a low altitude (usually of military aircraft) over spectators on the ground | Synonyms: fly-by, flyover |
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| flyspeck | (noun) a tiny dark speck made by the excrement of a fly | - |
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| flyswat | (noun) an implement with a flat part (of mesh or plastic) and a long handle; used to kill insects | Synonyms: flyswatter, swatter |
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| flyswatter | (noun) an implement with a flat part (of mesh or plastic) and a long handle; used to kill insects | Synonyms: flyswat, swatter |
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| flytrap | (noun) a trap for catching flies | - |
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| flyway | (noun) the geographic route along which birds customarily migrate | Synonyms: migration route |
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| flyweight | (noun) A weight class division in combat sports, often the lightest. | - |
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| (noun) an amateur boxer who weighs no more than 112 pounds | - |
| (noun) weighs no more than 115 pounds | - |
| flywheel | (noun) regulator consisting of a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine | - |
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| gadfly | (noun) any of various large flies that annoy livestock | - |
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| (noun) a persistently annoying person | Synonyms: blighter, cuss, pest, pesterer |
| gallfly | (noun) any of various insects that deposit their eggs in plants causing galls in which the larvae feed | - |
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| (noun) small solitary wasp that produces galls on oaks and other plants | Synonyms: cynipid gall wasp, cynipid wasp, gall wasp |
| (noun) fragile mosquito-like flies that produce galls on plants | Synonyms: gall gnat, gall midge |
| greenfly | (noun) greenish aphid; pest on garden and crop plants | - |
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| highflyer | (noun) a person of great ability and ambition | Synonyms: highflier |
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| horsefly | (noun) large swift fly the female of which sucks blood of various animals | Synonyms: cleg, clegg, horse fly |
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| (noun) winged fly parasitic on horses | Synonyms: Hippobosca equina, horse tick |
| housefly | (noun) common fly that frequents human habitations and spreads many diseases | Synonyms: house fly, Musca domestica |
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| mayfly | (noun) slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days | Synonyms: dayfly, shadfly |
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| medfly | (noun) small black-and-white fly that damages citrus and other fruits by implanting eggs that hatch inside the fruit | Synonyms: Ceratitis capitata, Mediterranean fruit fly |
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| rainfly | (noun) flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent | Synonyms: fly, fly sheet, tent-fly, tent flap |
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| sandfly | (noun) any of various small dipterous flies; bloodsucking females can transmit sandfly fever and leishmaniasis | Synonyms: Phlebotomus papatasii, sand fly |
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| sawfly | (noun) insect whose female has a saw-like ovipositor for inserting eggs into the leaf or stem tissue of a host plant | - |
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| shadfly | (noun) slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days | Synonyms: dayfly, mayfly |
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| shoofly | (noun) a child's rocking chair with the seat built between two flat sides that are shaped to resemble an animal (such as a swan or duck) | - |
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| (noun) an undercover police officer who investigates other policemen | - |
| snakefly | (noun) predatory insect of western North America having a long necklike prothorax | - |
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| spongefly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongillafly |
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| spongillafly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongefly |
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| stonefly | (noun) primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones | Synonyms: plecopteran, stone fly |
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| whitefly | (noun) minute insect that feeds on plant juices; related to scale insects | - |
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