fantastic vs wondrous

fantastic and wondrous both are adjectives.

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

As adjectives, fantastic and wondrous are synonyms defined as:

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

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

fantastic (adjective)	wondrous (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

fantastic (adverb)	wondrous (adverb)
	(used as an intensifier) excellently