Formal:
* Body of laws: This is a common and neutral way to refer to a collection of laws.
* Code of laws: Similar to "body of laws," but emphasizes the organized and systematic nature of the collection.
* Statutes: This refers to written laws enacted by a legislature.
Informal:
* A set of laws: This is a simple and straightforward way to refer to a collection of laws.
* A system of laws: This emphasizes the interconnectedness and organization of the laws.
More specific:
* A corpus of laws: This emphasizes the completeness and comprehensiveness of the collection.
* A jurisprudence: This refers to a system of law and its philosophy.
The best choice depends on the specific context and the desired tone.