Realm

A realm is a structure that contains planes of existence.

The material or physical realm of reality contains all planes of known existence within the 11 dimensions of our omniverse. Outside of reality it is unbound by dimensions.

A plane is a level or branch of existence, and many planes can exist within a realm (branches divided by instances). Thus a universe is one plane, and a multiverse can contain many planes.

Sometimes realms and planes can mean the same thing, such as in the Forgotten Realms Universe where there are material and other planes. One material plane analogous to ours is called realmspace. The outer planes contains gods and souls; the astral plane is the plane of thought, memory, and psychic energy; the far realm contains cosmic horrors; and so on.

A verse is a cosmological structure that holds everything in existence. This ranges from a universe to the outerverse.

The hyperverse is a hyper-dimensional extension of reality with an infinity of dimensions. This is the truth of reality but intangible to those who live in the omniverse.

The difference between the 1st Realm (Reality) and the 2nd Realm is so vast that the 2nd is only beginning to be understood by a Type II civilization and only accessible beyond Type VII.

The metaphysical planes beyond reality are contained in outerverses, and these are inaccessible and indescribable using dimensions. Space and time is boundless here. All existence here is abstract to those who live in the omniverse.

All realms together make up everything. The rest is outside and ultimately beyond.