barrier
US /ˈber.i.ɚ/
UK /ˈber.i.ɚ/

1.
a fence or other obstacle that prevents movement or access
:
•
The police set up a barrier to control the crowd.
•
A natural barrier of mountains separated the two countries.
2.
a circumstance or obstacle that prevents progress or access
:
•
Language can be a significant barrier to communication.
•
They faced many financial barriers to starting their business.