Common Adjectives:
* Dangerous
* Fabulous
* Curious
* Jealous
* Nervous
* Famous
* Serious
* Previous
* Humorous
* Courageous
* Suspicious
* Various
* Numerous
* Spacious
* Ambitious
* Mysterious
* Gorgeous
* Enormous
* Delicious
* Grateful
* Joyous
Less Common Adjectives:
* Aqueous
* Extraneous
* Gregarious
* Pompous
* Capricious
* Ingenious
* Meritorious
* Malicious
* Treacherous
Nouns:
* Chorus (plural choruses)
* Focus (plural focuses)
This is just a small sample. There are many more words ending in "ous"!