phantom vs illusion

phantom and illusion both are nouns.

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

As nouns, illusion is a hypernym of phantom; that is, illusion is a word with a broader meaning than phantom:

Other hypernyms of phantom include semblance.

phantom (noun)	illusion (noun)
something existing in perception only	the act of deluding; deception by creating illusory ideas
a ghostly appearing figure	an illusory feat; considered magical by naive observers
	something many people believe that is false
	an erroneous mental representation

phantom (adjective)	illusion (adjective)
something apparently sensed but having no physical reality