delusion

As a noun delusion

is a false belief that is resistant to confrontation with actual facts.

As a verb hallucinate is

(transitive|and|intransitive) to seem to perceive things (with one or more of one's senses) which are not really present; to have visions; to experience a hallucination.

As a verb misconstrue

is to interpret erroneously, to understand incorrectly; to misunderstand.

As a noun delusion is

a false belief that is resistant to confrontation with actual facts.

As a verb misunderstand

is to understand incorrectly, while thinking one has understood correctly.

As a noun delusion is

a false belief that is resistant to confrontation with actual facts.

As nouns the difference between delusion and misbelief

is that delusion is a false belief that is resistant to confrontation with actual facts while misbelief is an erroneous belief.

Delusion is a related term of apparition.

As nouns the difference between delusion and apparition

is that delusion is a false belief that is resistant to confrontation with actual facts while apparition is an act of becoming visible; appearance; visibility.

As nouns the difference between delusion and dream

is that delusion is a false belief that is resistant to confrontation with actual facts while dream is imaginary events seen in the mind while sleeping.

As a verb dream is

to see imaginary events in one's mind while sleeping.

Delusion is a related term of thing.

As nouns the difference between delusion and thing

is that delusion is a false belief that is resistant to confrontation with actual facts while thing is (chiefly|historical) a public assembly or judicial council in a germanic country.

Delusion is a related term of craziness.

As nouns the difference between delusion and craziness

is that delusion is a false belief that is resistant to confrontation with actual facts while craziness is (uncountable) the state of being broken in mind; imbecility or weakness of intellect; derangement.