Compound Nouns

A compound noun is a noun made up of two or more words that work together to name a single person, place, thing, or idea. At this level, you will master all three forms of compound nouns -- closed, hyphenated, and open -- and handle the tricky spelling and spacing choices that appear in PSLE-level questions.

What You'll Learn

In this lesson, you will learn:

• How to confidently identify and classify compound nouns as closed, hyphenated, or open in complex sentences
• How to choose the correct form of a compound noun when spelling and spacing are tested
• How to recognise compound nouns that change meaning depending on whether they are written as one word, two words, or with a hyphen
• How to avoid common PSLE-level errors involving compound noun formation and usage

When to Use

You already know the basics of compound nouns from earlier levels. Now you need to apply that knowledge in more demanding contexts:

1. Formal and academic writing: "The spokesperson for the committee addressed the media at the press conference."
2. Describing everyday items precisely: "She packed her toothbrush, raincoat, and sunglasses into her carry-on bag."
3. Using hyphenated compounds correctly: "The well-known author signed copies of her latest best-seller at the bookshop."
4. Distinguishing meaning through form: "He is a man-eater (a creature that eats people) versus a man eater (a man who eats)."
5. PSLE composition and comprehension: "The breakthrough in the investigation came when the detective discovered a hidden doorway behind the bookshelf."

How to Form

The Three Forms of Compound Nouns

Common Compound Noun Patterns

Compound Nouns That Change Meaning by Form

Pay close attention -- these are commonly tested at PSLE level.

Key Rules

1. There is no single rule for which form to use: Unlike many grammar rules, compound noun forms must often be memorised or checked in a dictionary. "Ice cream" is open, but "toothpaste" is closed -- there is no logical reason. When in doubt during an exam, go with the form you have seen most often in your textbooks.

2. Compound nouns formed with "self-" are always hyphenated: self-confidence, self-esteem, self-control, self-respect. Never write "selfconfidence" or "self confidence."

3. Compound nouns formed with "-in-law" are always hyphenated: mother-in-law, father-in-law, sister-in-law. The plural adds -s to the first word: mothers-in-law (not "mother-in-laws").

4. Compound nouns from phrasal verbs are usually closed or hyphenated as nouns: The phrasal verb "break down" becomes the noun breakdown. "Check up" becomes check-up. "Take off" becomes takeoff. Note that the verb form stays as two words: "The car will break down," but "The car had a breakdown."

5. The stress pattern can help you identify compound nouns in speech: Compound nouns are usually stressed on the first word: BLACKboard (a writing board) versus black BOARD (a board that is black). This distinction matters for comprehension questions.

6. Some compound nouns are evolving: Language changes over time. "E-mail" was once hyphenated, but "email" (closed) is now standard. "Web site" was once open, but "website" (closed) is now standard. In PSLE, use the most current accepted form.

Common Mistakes

Clue Words

Compound nouns that are always closed (one word)

toothbrush, toothpaste, raincoat, sunflower, football, bedroom, playground, homework, airport, doorbell, newspaper, bookshelf, headache, earthquake, waterfall

Compound nouns that are always hyphenated

mother-in-law, father-in-law, self-esteem, self-confidence, self-control, well-being, passer-by, check-up, runner-up, merry-go-round

Compound nouns that are always open (two words)

bus stop, ice cream, post office, living room, swimming pool, high school, full moon, sea level, traffic light, fire engine

Compound nouns from phrasal verbs (noun form vs verb form)

breakdown / break down, takeoff / take off, checkout / check out, setup / set up, makeup / make up, turnover / turn over

Tip: When you are unsure whether a compound noun is closed, hyphenated, or open, try the "dictionary test" -- look it up. For exams, remember the most commonly tested ones: "self-" is always hyphenated, "-in-law" is always hyphenated, and phrasal verb nouns are usually closed.

Practice Tips

1. Build a compound noun notebook: Create three columns -- Closed, Hyphenated, and Open. Every time you encounter a new compound noun in your reading, add it to the correct column. Review the list before exams. This is especially useful because many compound noun forms simply need to be memorised.

2. The "noun or verb?" test for phrasal verb compounds: When you see words like "breakdown," "takeoff," or "checkout," ask yourself: is it being used as a noun or a verb? As a noun, it is usually one word or hyphenated. As a verb, it stays as two words. "The plane began to take off" (verb, two words). "The takeoff was smooth" (noun, one word).

3. Practise with PSLE-style error-spotting questions: Write sentences with intentional spacing or hyphenation mistakes in compound nouns. Then swap with a study partner and spot each other's errors. Focus on the tricky ones: is it "icecream" or "ice cream"? Is it "bus-stop" or "bus stop"?

4. The meaning-change drill: Practise pairs like "greenhouse" vs "green house" and "blackboard" vs "black board." Write a sentence for each form showing the different meaning. This sharpens your ability to handle PSLE comprehension questions where compound noun form affects meaning.

Quick Reference

Three Forms at a Glance

Noun vs Verb Form