tube; cylinder; to encase in sth cylindrical (such as hands in sleeves etc)

microphone; (telephone) receiver; handset; megaphone; (fig.) mouthpiece; spokesperson

bazooka; rocket launcher

flashlight

syringe

telephone receiver; headphone; earphone; earpiece; stethoscope

mailbox; postbox

bugle

a pump; water pump

circular cylinder; drum

sleeve; a tube for wrapping

barrel of a gun

inflator; bicycle pump

roller; cylinder (machine part); drum

chimney; stovepipe; smokestack

ice-cream cone

bamboo tube; bamboo pipe

pen container; brush pot

sleeve

trouser leg

mailbox; pillar box; (old) letter

graduated measuring cylinder; volumetric cylinder

traffic cone; road cone

kaleidoscope

loudhailer; megaphone; one who parrots sb; mouthpiece

(metaphorical) punching bag; undeserving target of sb's wrath

hair roller

trashcan

bicycle pump

(Cantonese-influenced Mandarin) (coll.) traffic cone