Is restriction a synonym for regulation?

Answer 1

It depends on whether you are talking about a physical restriction. If you are, then no. Otherwise, it is usually safe to say that it is a synonym.

Answer 2

In some contexts, restriction can be considered a synonym for regulation. Both terms involve setting limitations or controls on something. However, a regulation tends to refer more specifically to rules or laws established by an authority, while a restriction can be more broadly based on limitations or constraints.