runner (n.)

• agent
• appendage
• arm
• bine
• blade
• bough
• branch
• carrier
• commissionaire
• conductor
• contrabandist
• courier
• creeper
• deadwood
• driver
• emissary
• engineer
• express
• flagellum
• flier
• fork
• frond
• functionary
• gate
• go-between
• goer
• gofer
• gunrunner
• hand
• handler
• hummer
• hurdler
• hustler
• imp
• jockey
• jogger
• joint
• leg
• limb
• link
• lobe
• lobule
• manipulator
• member
• messenger
• nuncio
• offshoot
• operative
• operator
• organ
• page
• pilot
• pinion
• post
• racer
• ramification
• rumrunner
• scion
• scorcher
• shoot
• sled
• sleigh
• slip
• smuggler
• snowmobile
• spear
• speeder
• spray
• sprig
• sprit
• sprout
• sprue
• spur
• steersman
• stem
• stepper
• stolon
• sucker
• switch
• tail
• tedge
• tendril
• thallus
• twig
• weasel
• wing