VERB + FLY

swat
I swatted the fly with a newspaper

FLY + VERB

buzz
A fly was buzzing against the window
crawl
land (on sth), settle (on sth)
A fly settled on the butter

FLY + NOUN

larva
repellent, spray

ADJ

button/button-up, zip/zipped

VERB + FLY

button (up), do up, zip up
undo, unzip
Do you know your flies are undone?

FLY + NOUN

button