Addendum and Extension

Addendum noun - Something added (as by growth).

Extension is a synonym for addendum in addition topic. In some cases you can use "Extension" instead a noun "Addendum", when it comes to topics like adjunct, added.

Extension noun - The act of making longer.

Addendum is a synonym for extension in addition topic. You can use "Addendum" instead a noun "Extension", if it concerns topics such as enlargement, annexe.

Nearby Words: extend, extended, extent, extensive, extensively