fantasy vs fantastic

fantasy is a noun but fantastic is not a noun.

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

fantasy (noun)	fantastic (noun)
imagination unrestricted by reality
something many people believe that is false
fiction with a large amount of imagination in it

fantasy (adjective)	fantastic (adjective)
	extraordinarily good or great; used especially as intensifiers
	extravagantly fanciful in design, construction, appearance
	ludicrously odd
	existing in fancy only
	fanciful and unrealistic; foolish

fantasy (verb)	fantastic (verb)
indulge in fantasies