howling vs tremendous

howling is a noun but tremendous is not a noun.

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

As adjectives, howling and tremendous are synonyms defined as:

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

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

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

howling (adjective)	tremendous (adjective)
extraordinarily good or great; used especially as intensifiers	extraordinarily good or great; used especially as intensifiers
	extraordinarily large in size or extent or amount or power or degree
	extreme in degree or extent or amount or impact