howling vs marvelous

howling is a noun but marvelous is not a noun.

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

As adjectives, howling and marvelous are synonyms defined as:

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

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

howling (noun)	marvelous (noun)
a long loud emotional utterance

howling (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