enforceˈment noun

1. The act of enforcing
2. Compulsion
3. A giving effect to
4. Something that enforces

enforcˈer noun

1. Someone who or something which enforces
2. A member of a gang, etc who uses strong-arm tactics to enforce the power of the gang or its leaders (slang, orig US)

enforcement notice noun (law)

An order served on someone who has breached town-planning regulations

enforcement officer noun

enforcement work noun