phenomenal vs howling

phenomenal is not a noun while howling is a noun.

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

As adjectives, phenomenal and howling are synonyms defined as:

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

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

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

phenomenal (adjective)	howling (adjective)
of or relating to a phenomenon	extraordinarily good or great; used especially as intensifiers
extraordinarily good or great; used especially as intensifiers