"Passageway" is one word.
Ramp
Strait
ramp
Passage.
Two nostrills
A strait
isthmus
There isn't one. But you can get one for your house.
Anastomosis
The two passageway of unclean blood as it enters the body
no cause the northeast and the northwest passageway does not exist.
The passageway is the Strait of Gibraltar.