Mouth

Face (specifically in slang or informal usage)

चेहरा

English Usage: She has a beautiful boca that lights up the room.

Hindi Usage: उसका चेहरा सुंदर है जो कमरे को रोशन कर देता है।

To open one's mouth (informal/slang)

मुंह खोलना

English Usage: Don't boca when you're chewing!

Hindi Usage: जब तुम चबा रहे हो तो मुंह न खोलो!