marvellous vs howling

marvellous is not a noun while howling is a noun.

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

As adjectives, marvellous and howling are synonyms defined as:

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

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

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

marvellous (adjective)	howling (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