terrific vs marvellous

terrific and marvellous both are adjectives.

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

As adjectives, terrific and marvellous are synonyms defined as:

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

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

terrific (adjective)	marvellous (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