thunder vs thunderous

thunder is a noun but thunderous is not a noun.

Word	Noun	Adjective	Verb	Adverb
thunder	Yes	No	Yes	No
thunderous	No	Yes	No	No

thunder (noun)	thunderous (noun)
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a deep prolonged loud noise
a booming or crashing noise caused by air expanding along the path of a bolt of lightning

thunder (adjective)	thunderous (adjective)
	loud enough to cause (temporary) hearing loss
	extremely ominous

thunder (verb)	thunderous (verb)
utter words loudly and forcefully
to make or produce a loud noise
move fast, noisily, and heavily
be the case that thunder is being heard