fly (any insect of infraorder Muscomorpha), person of no worth, pisher...

catching flies, fly-catcher, flytrap...

fly-net cupboard

Diptera

jumping spider (any spider of family Salticidae)

small characters, tiny handwriting, as small as the head of a fly...

greenbottle fly (esp. species Lucilia caesar)

bluebottle fly, little pest

horse botfly (Gasterophilus intestinalis)

catching flies, fly-catcher, flytrap...

housefly (Musca domestica), house fly

bluebottle fly, little pest

dung fly (any fly of family Scathophagidae)

small household fly (e.g. fruit fly)

fly swatter, flyswatter, fly swat

flesh fly (any fly of family Sarcophagidae)

large silvery fly

blowfly (excluding bluebottles and greenbottles)

ox warble fly (Hypoderma bovis)

fruit fly (any insect of family Tephritidae)

cucurbit leaf beetle (Aulacophora femoralis)

stable fly (Stomoxys calcitrans)

biting midge (any insect of family Ceratopogonidae), no-see-um, plant hopper (any insect of family Delphacidae)

gall midge (any insect of family Cecidomyiidae)

gall midge (any insect of family Cecidomyiidae)

louse fly (any fly of family Hippoboscidae)

lauxaniid fly (any fly of family Lauxaniidae), flesh fly (any fly of family Sarcophagidae)

phorid fly

Lord of the Flies (1954 novel by William Golding)

Venus flytrap, Venus's flytrap