wonderful vs marvelous

wonderful and marvelous both are adjectives.

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

As adjectives, wonderful and marvelous are synonyms defined as:

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

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

wonderful (adjective)	marvelous (adjective)
extraordinarily good or great; used especially as intensifiers	extraordinarily good or great; used especially as intensifiers
	too improbable to admit of belief
	being or having the character of a miracle