Words Ending in -ous vs -us

-ous vs -us Endings | Which Is Correct?
🔚Commonly Misspelled

Words Ending in -ous vs -us

‘Dangerous’ or ‘dangerus’? ‘Famous’ or ‘famus’? The -OUS ending is for adjectives (describing words), while -US ending is for nouns (thing words). Mix them up and your spelling looks wrong immediately!

Quick rule: If the word describes something (adjective) → -OUS: dangerous, famous, nervous. If it’s a thing/person (noun) → -US: campus, bonus, virus. This page has 50 examples to make the pattern stick!

📝 -OUS Adjectives (Describing Words)

1
dangerousdangerus ✗⭐⭐
DAYN-jur-us
Not safe
💡 DANGER + OUS = adjective!
“A dangerous road.”
2
famousfamus ✗⭐⭐
FAY-mus
Well-known
💡 FAME + OUS = adjective!
“A famous actor.”
3
nervousnervus ✗⭐⭐
NUR-vus
Anxious, worried
💡 NERVE + OUS = adjective!
“Feeling nervous before exams.”
4
curiouscurius ✗⭐⭐
KYOOR-ee-us
Wanting to know
💡 CURI + OUS = adjective!
“A curious child.”
5
seriousserius ✗⭐⭐
SEER-ee-us
Not joking
💡 SERI + OUS = adjective!
“A serious matter.”
6
previousprevius ✗⭐⭐
PREE-vee-us
Before this
💡 PREVI + OUS = adjective!
“The previous chapter.”
7
mysteriousmysterius ✗⭐⭐
mis-TEER-ee-us
Full of mystery
💡 MYSTERY → mysteri + OUS
“A mysterious stranger.”
8
generousgenerus ✗⭐⭐
JEN-uh-rus
Giving freely
💡 GENER + OUS = adjective!
“A generous donation.”
9
marvellousmarvelous ✗⭐⭐
MAR-vuh-lus
Wonderful
💡 MARVEL + LOUS (British: double L!)
“A marvellous performance!”
10
jealousjelous ✗⭐⭐
JEL-us
Envious
💡 JEALOUS — just memorize!
“Don’t be jealous.”

📝 More -OUS Adjectives

11
enormousenormus ✗⭐⭐
ih-NOR-mus
Very large
💡 ENORM + OUS
“An enormous elephant!”
12
tremendoustremendus ✗⭐⭐
trih-MEN-dus
Huge, great
💡 TREMEND + OUS
“A tremendous effort.”
13
gorgeousgorgeus ✗⭐⭐
GOR-jus
Very beautiful
💡 GORGE + OUS
“A gorgeous sunset.”
14
ridiculousridiculus ✗⭐⭐
rih-DIK-yoo-lus
Absurd, silly
💡 RIDICUL + OUS
“A ridiculous idea!”
15
consciousconscous ✗⭐⭐⭐
KON-shus
Aware, awake
💡 CONSCI + OUS (SCI inside!)
“Be conscious of your actions.”
16
courageouscouragous ✗⭐⭐
kuh-RAY-jus
Very brave
💡 COURAGE + OUS (keep E!)
“A courageous soldier.”
17
outrageousoutragous ✗⭐⭐
owt-RAY-jus
Shocking
💡 OUTRAGE + OUS (keep E!)
“An outrageous price!”
18
adventurousadventurus ✗⭐⭐
ad-VEN-chur-us
Loving adventure
💡 ADVENTURE → adventur + OUS
“An adventurous journey.”
19
continuouscontinous ✗⭐⭐
kun-TIN-yoo-us
Without stopping
💡 CONTINUE → continu + OUS
“Continuous improvement.”
20
religiousreligous ✗⭐⭐
rih-LIJ-us
Relating to religion
💡 RELIGION → religi + OUS
“Religious festivals.”

📦 -US Nouns (Thing/Person Words)

21
campuscampous ✗⭐
KAM-pus
School/college grounds
💡 CAMPUS = Latin noun, stays -US!
“A beautiful campus.”
22
bonusbonous ✗⭐
BOH-nus
Extra reward
💡 BONUS = Latin noun, stays -US!
“A performance bonus.”
23
virusvirous ✗⭐
VY-rus
Infectious agent
💡 VIRUS = Latin noun!
“A computer virus.”
24
focusfocous ✗⭐
FOH-kus
Centre of attention
💡 FOCUS = Latin noun!
“Focus on your studies.”
25
geniusgenious ✗⭐⭐
JEE-nee-us
Extremely clever person
💡 GENIUS = Latin noun (not -ious!)
“She’s a genius!”
26
censussensus ✗⭐⭐
SEN-sus
Population count
💡 CENSUS = Latin noun!
“The national census.”
27
statusstatous ✗⭐
STAY-tus
Current condition
💡 STATUS = Latin noun!
“What’s the status?”
28
stimulusstimulous ✗⭐⭐
STIM-yoo-lus
Something that prompts
💡 STIMULUS = Latin noun!
“An economic stimulus.”
29
radiusradious ✗⭐⭐
RAY-dee-us
Distance from centre
💡 RADIUS = Latin noun!
“The radius of a circle.”
30
syllabussyllabous ✗⭐⭐
SIL-uh-bus
Course outline
💡 SYLLABUS = Latin noun!
“Check the syllabus.”

🎯 -IOUS vs -EOUS (Tricky!)

31
anxiousanxous ✗⭐⭐
ANK-shus
Worried
💡 -IOUS: anx + IOUS
“Feeling anxious.”
32
spaciousspaceous ✗⭐⭐
SPAY-shus
Having lots of space
💡 SPACE → spac + IOUS
“A spacious room.”
33
preciouspreccious ✗⭐⭐
PRESH-us
Very valuable
💡 PREC + IOUS
“Precious gems.”
34
consciousconscous ✗⭐⭐
KON-shus
Aware
💡 CONSCI + OUS
“Stay conscious.”
35
deliciousdelicous ✗⭐⭐
dih-LISH-us
Tasty
💡 DELIC + IOUS
“Delicious food!”
36
gorgeousgorgeus ✗⭐⭐
GOR-jus
Beautiful
💡 GORGE + OUS (not IOUS!)
“You look gorgeous.”
37
courageouscouragous ✗⭐⭐
kuh-RAY-jus
Brave
💡 COURAGE + OUS (keep E!)
“A courageous act.”
38
miscellaneousmiscellanious ✗⭐⭐⭐
mis-uh-LAY-nee-us
Mixed, various
💡 MISCELLANE + OUS (not -IOUS!)
“Miscellaneous items.”
39
spontaneousspontanious ✗⭐⭐
spon-TAY-nee-us
Unplanned
💡 SPONTANE + OUS (not -IOUS!)
“A spontaneous decision.”
40
simultaneoussimultanious ✗⭐⭐
sy-mul-TAY-nee-us
At the same time
💡 SIMULTANE + OUS
“Simultaneous translation.”

⚠️ Words That LOOK Like -ous But Aren’t

41
purposepourpose ✗⭐
PUR-pus
Aim, intention
💡 Ends in -OSE not -OUS!
“What’s the purpose?”
42
becausebecouse ✗⭐
bih-KOZ
For the reason
💡 Ends in -AUSE not -OUS!
“Because I said so.”
43
tortoisetortous ✗⭐⭐
TOR-tus
Slow reptile
💡 Ends in -OISE not -OUS!
“The tortoise and the hare.”
44
promisepromous ✗⭐
PROM-iss
A pledge
💡 Ends in -ISE not -OUS!
“Keep your promise.”
45
purchasepurchous ✗⭐⭐
PUR-chuss
To buy
💡 Ends in -ASE not -OUS!
“Make a purchase.”
46
porpoiseporpous ✗⭐⭐
POR-pus
Sea mammal
💡 Ends in -OISE not -OUS!
“A dolphin-like porpoise.”
47
surplussurplous ✗⭐⭐
SUR-plus
Extra, excess
💡 Ends in -US (noun!)
“A food surplus.”
48
octopusoctopous ✗⭐
OK-tuh-pus
8-armed sea creature
💡 Ends in -US (noun!)
“An octopus has 8 arms.”
49
cactuscactous ✗⭐
KAK-tus
Desert plant
💡 Ends in -US (noun!)
“A prickly cactus.”
50
hippopotamushippopotamous ✗⭐⭐
hip-oh-POT-uh-mus
Large river animal
💡 Ends in -US (noun!)
“A hippo at the zoo.”

📐 5 Spelling Rules

-OUS = Adjective (Describing Word)

If the word describes something, it ends in -OUS: dangerous, famous, nervous, curious, generous.

✅ dangerous, famous, nervous, curious, generous, enormous

-US = Noun (Thing/Person)

If the word is a thing or person, it often ends in -US: campus, bonus, virus, focus, genius.

✅ campus, bonus, virus, focus, genius, status, radius

-EOUS After G (Keep E!)

After G, keep E to keep G soft: courageous, outrageous, gorgeous, advantageous.

✅ courageous, outrageous, gorgeous, advantageous

-ANEOUS/-EOUS (Not -ANIOUS/-IOUS!)

miscellaneous (not miscellanious), spontaneous (not spontanious), simultaneous (not simultanious).

✅ miscellaneous, spontaneous, simultaneous, instantaneous

Latin Nouns Keep -US

Words borrowed from Latin as nouns keep their -US ending: campus, bonus, stimulus, radius, syllabus.

✅ campus, bonus, virus, stimulus, radius, syllabus, census

🐝 Spelling Quiz

1. ‘Dangerous’ — adjective ending:
2. ‘Campus’ — noun ending:
3. ‘Courageous’ keeps E because:
4. ‘Miscellaneous’ ends in:
5. ‘Genius’ is:
6. ‘Famous’ describes = :
7. ‘Virus’ is a thing = :
8. ‘Conscious’ ends in:
9. ‘Delicious’ ends in:
10. Quick rule: describing = ?

🔀 Word Scramble

Unscramble the letters

SUORGANDE
SUOMFA
SUPACM
SUINEG
SUOAGERUCO

✏️ Fill in Missing Letters

Type the missing letters

danger_us
fam_us
camp_s
bonu_
courag_ous

❓ FAQ

How to tell -ous from -us?

Simple! Is the word describing something (adjective)? → -OUS (dangerous, famous). Is it a thing or person (noun)? → -US (campus, bonus, virus). Adjective = -OUS, Noun = -US.

Why keep E in ‘courageous’?

Without E, the G would make a hard sound: ‘courag-ous’ → ‘courag-us’ (hard G). The E keeps G soft (like ‘j’). Same for outrageous, advantageous.

What about words ending in -ious?

-IOUS is a variant of -OUS: anxious, spacious, precious, delicious. They’re all still adjectives! The I comes from the root word pattern.

Is ‘genius’ -ous or -us?

Genius is a NOUN (a smart person), so it ends in -US. But ‘ingenious’ (adjective meaning clever) ends in -IOUS. The part of speech determines the ending!

What about ‘miscellaneous’ vs ‘miscellanious’?

It’s miscellANEOUS (not miscellANIOUS). The ending is -ANEOUS, not -ANIOUS. Same pattern: spontANEOUS, simultANEOUS, instantANEOUS.

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