Self-legislation and Self-government

Self-government and self-legislation are semantically related In some cases you can use "Self-government" instead a noun phrase "Self-legislation".

Self-government noun - Government in which the supreme power is held by the people and used by them directly or indirectly through representation.

Self-legislation and self-government are semantically related in independence topic. You can use "Self-legislation" instead a noun phrase "Self-government".