underpass (n.)

• access
• aisle
• alley
• ambulatory
• aperture
• arcade
• artery
• avenue
• channel
• cloister
• colonnade
• communication
• conduit
• connection
• corridor
• defile
• exit
• ferry
• ford
• gallery
• inlet
• interchange
• intersection
• junction
• lane
• opening
• outlet
• overpass
• pass
• passage
• passageway
• portico
• tunnel