wonderful vs fantastic

wonderful and fantastic both are adjectives.

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

As adjectives, wonderful and fantastic are synonyms defined as:

wonderful and fantastic: extraordinarily good or great; used especially as intensifiers

Other synonyms of wonderful include grand, howling, marvellous, marvelous, phenomenal, rattling, terrific, tremendous, wondrous.

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