Compound Nouns
A2 · ElementaryNounsTwo or more words, one single thing — that's a compound noun. The tricky part isn't the idea, it's knowing whether to write it as two words, a hyphenated word, or one solid word.
What you'll learn
- How two or more words combine to name one single thing
- The main pattern (noun + noun) plus a few other common patterns
- Open, hyphenated, and closed compounds — and why you check a dictionary instead of guessing
- Common word-order and spelling mistakes to avoid
The core idea
A compound noun is two or more words joined together to name one single thing — a new "thing" with its own meaning, not just the words added up separately. Sunglasses aren't "sun" plus "glasses" as two ideas — they're one item you buy, wear, and forget on the bus.
Once two words form a compound noun, they act like a single noun in the sentence. That includes the plural: you make two bus stops, not two "buses stop."
The main pattern: noun + noun
The most common way English builds a compound noun is two nouns side by side, with the first one describing or limiting the second: a bus stop is a stop for buses, a coffee shop is a shop that sells coffee, and screen time is time spent looking at a screen.
Check the order by asking what kind of thing it is: the second word names the thing, and the first word says what kind. Reverse it and the phrase usually just stops making sense — "a stop bus" isn't anything.
Other common patterns
Noun + noun is the big one, but you'll meet compounds built other ways too. An adjective plus a noun can name one specific thing, not just describe it: a blackboard isn't just any board that happens to be black — it's the specific board teachers write on.
A verb (often with -ing) plus a noun names something by what it does: a washing machine is a machine that washes, and check-in is the act — and the moment — of checking in for a flight, a hotel, or an appointment.
Open, hyphenated, or closed — check, don't guess
Every compound noun is written one of three ways: open, as two separate words (bus stop, coffee shop); hyphenated, joined by a dash (mother-in-law, check-in); or closed, written as one word with no space (toothpaste, smartphone).
Here's the part that trips learners up: there's no single rule that predicts which form a compound uses. It's decided word by word, by convention and common usage — and it can even shift over time as a compound becomes more familiar.
When you're not sure how to write a specific compound, look it up instead of guessing. A quick dictionary check is faster, and far more reliable, than trying to reason your way to the answer.
Real English
Watch out
School bus is written as two separate words — don't close it up into one word just because other compounds (like toothpaste) are closed.
Reversing the two nouns doesn't just sound odd — it isn't a real phrase. The first noun describes the second: a bus stop is a stop for buses, not a bus for stops.
Mother-in-law needs its two hyphens — without them, it reads as three loose words instead of one relationship.
Sunglasses is closed — one word, no space. Plenty of everyday closed compounds get accidentally split into two words; check a dictionary if you're unsure.
Real life — Talking about the morning commute
"Are you walking to the bus stop, or do you want a ride?"
"I'll walk — there's a new coffee shop right next to it, so I can grab something on the way."
"Good call. Traffic is brutal during rush hour anyway."
"True. I'll come in through the back door — it's closer to my desk."
Practice
Exercise 1 · Choose the correct sentence
Which sentence uses a real compound noun?
Exercise 2 · Choose the real word
Which word names a real everyday object?
Exercise 3 · Choose the correct spelling
Which is the standard spelling?
Exercise 4 · Choose the correct spelling
Which is the standard spelling?
Exercise 5 · Choose the correct phrase
Which is correct?
Exercise 6 · Sort into groups
0 / 6 sorted
Exercise 7 · Build the sentence
Exercise 8 · Build the sentence
Exercise 9 · Build the sentence
Exercise 10 · Complete the answer
What do you call the online place where a company shows information about itself? (one word)
Exercise 11 · Complete the answer
What do you call the small tool you use to clean your teeth? (one word)
Exercise 12 · Complete the answer
What do you call a small piece of plastic you use to pay instead of cash? (two words)
Exercise 13 · Fix the mistake
Fix the mistake and type the correct sentence: "The box mail is at the end of the driveway."
Exercise 14 · Fix the mistake
Fix the mistake and type the correct sentence: "I checked the company web site for an hour."
Exercise 15 · Real-life scenario
You're filling out a school form for your child's emergency contact. Which entry makes sense in the "who is this person" field?
Exercise 16 · Real-life scenario
A friend asks what to wear if it starts raining on your walk. What compound noun do you answer with? (one word)
Quick challenge
Five mixed questions to check what stuck.
Question 1 / 5
Score: 0/0
What do you call the paste you use to clean your teeth? (one word)
You learned
- A compound noun is two or more words that join to name one single thing.
- Noun + noun is the most common pattern (bus stop, coffee shop), but adjective+noun and verb+noun patterns exist too (blackboard, washing machine).
- Word order matters — reversing the two parts usually breaks the meaning entirely.
- Compound nouns are written open, hyphenated, or closed — and there's no single rule that predicts which.
- When you're not sure how a compound is written, check a dictionary instead of guessing.
Related grammar lessons
Possessive Nouns
Learn how to form possessive nouns in English — singular noun + 's, plural nouns ending in -s, irregular plurals, and the difference between its and it's.
Countable and Uncountable Nouns
Learn how to use a/an, plural forms, some, much and many correctly — plus the "piece of" pattern for talking about one unit of an uncountable noun like advice or information.
Noun Phrases
Learn how English builds a noun phrase from a determiner, modifiers and a head noun — and how to expand a simple phrase step by step into a precise, natural description.
Singular and Plural Nouns
Learn how to form plural nouns in English — the regular -s/-es rule, spelling changes like city to cities and leaf to leaves, common irregular plurals, and the apostrophe mistake to avoid.