phenomenal vs marvellous

phenomenal and marvellous both are adjectives.

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

As adjectives, phenomenal and marvellous are synonyms defined as:

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

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

phenomenal (adjective)	marvellous (adjective)
of or relating to a phenomenon	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