便

transportation access; convenience of access (by car, train, etc.); accessibility

Colloquial

toilet insect; insects that frequent toilets

overnight transportation (train service, flight, etc.); late-night departure; red-eye flight

surface mail

direct flight

correspondence delivery (via a private courier service)

first flight; maiden voyage

first letter; first correspondence

Medicine

steatorrhea; fatty stools

postage; postal charges

to suit the convenience of; to accommodate

mailbox; letter box; letterbox; mail slot

transportation access; access to (public) transportation; convenience of access (by road or rail); transport links

postbox; mailbox; pillar box

postal delivery; mail delivery

postman; mailman; mail carrier

public lavatory; public toilet; public restroom

Slang; Vulgar expression or word; Derogatory

slut; whore; floozy; tramp; trollop

to urinate; to pee; to piss

Idiomatic expression

hearsay; rumour

Proverb

the end justifies the means; circumstances may justify a lie

mail clerk; post-office clerk; post-office worker; postal employee; postal worker

to wet one's pants; to wet oneself

mailman; postman; mail carrier; post carrier

stinking of urine

childish; immature; inexperienced

postal code

postman; postwoman; postal delivery worker