1) Barrier attendant 2) Doorkeeper 3) Entrance guard 4) Entrance keeper 5) Guard 6) Guard at an entrance 7) Guard at the portal 8) Guard of a sort 9) Guy giving entrance exams 10) One may let you in 11) One tending an entranceway 12) Peter, for a lofty example 13) Sentry 1) Stpeter 
• (n.) A gate keeper; a gate tender.
Gate'man noun A gate keeper; a gate tender.