As a noun superhero

is any kind of fantasy/science fiction crime-fighting character, often with supernatural powers or equipment, in popular children's and fantasy literature.

As an adjective undefined is

lacking a definition or value.

As a proper noun academy

is (classical studies|history) the school for advanced education founded by plato; the garden where plato taught brown, lesley, ed the shorter oxford english dictionary 5th oxford: oxford university press, 2003.

As an adjective undefined is

lacking a definition or value.

As a noun requisition

is requisition.

As an adjective undefined is

lacking a definition or value.

As a verb forbid

is to disallow; to proscribe.

As an adjective undefined is

lacking a definition or value.

As a noun authority

is (label) the power to enforce rules or give orders.

As an adjective undefined is

lacking a definition or value.

As a noun piccalilli

is (british) a yellow pickle made from cauliflower, vegetable marrow, and other vegetables, pickled with vinegar, salt, sugar, and spiced with mustard, turmeric, and other spices.

As an adjective undefined is

lacking a definition or value.

As a noun sanction

is an approval, by an authority, generally one that makes something valid.

As a verb sanction

is to ratify; to make valid.

As an adjective undefined is

lacking a definition or value.

As a verb applies

is (apply).

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between realistic and undefined

is that realistic is expressed or represented as being accurate while undefined is lacking a definition or value.

As a noun homogenization

is the act of making something homogenous, or the same throughout; or the tendency of something to be come homogenous.

As an adjective undefined is

lacking a definition or value.