terrific vs marvelous

terrific and marvelous both are adjectives.

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

As adjectives, terrific and marvelous are synonyms defined as:

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

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

terrific (adjective)	marvelous (adjective)
causing extreme terror	extraordinarily good or great; used especially as intensifiers
extraordinarily good or great; used especially as intensifiers	too improbable to admit of belief
very great or intense	being or having the character of a miracle