illusion vs fantasy

illusion and fantasy both are nouns.

Word	Noun	Adjective	Verb	Adverb
illusion	Yes	No	No	No
fantasy	Yes	No	Yes	No

As nouns, illusion and fantasy are synonyms defined as:

Other synonyms of illusion include fancy, phantasy.

illusion (noun)	fantasy (noun)
the act of deluding; deception by creating illusory ideas	imagination unrestricted by reality
an illusory feat; considered magical by naive observers	something many people believe that is false
something many people believe that is false	fiction with a large amount of imagination in it
an erroneous mental representation

illusion (verb)	fantasy (verb)
	indulge in fantasies