to release (in any of the senses above)

guard (person who or thing that protects something)

viaduct; overpass

card / (uncommon) playing card

curd

a thesis; a statement or argument about a topic / a doctrine or platform for a political movement

aura (an invisible force)

baht (Thai currency)

Islamabad (the capital city of Pakistan)

a case, as a container for something / a case, as an instance, event, situation / (grammar) grammatical case