A compound word is formed when two or more words are joined together to create a new word that has its own unique meaning. These words can be written in three ways:

  • Closed: The words are joined together without any space (e.g., sunflower, baseball).
  • Hyphenated: The words are joined together with a hyphen (e.g., well-being, self-esteem).
  • Open: The words are separate but function as a single word (e.g., ice cream, living room).

Compound words act as a single word and are used like any other noun, verb, adjective, or adverb.

Open Compound WordsClosed Compound Words
Post office

High school

Dining room

Swimming pool

Living room
Football

Butterfly

Rainbow

Popcorn

Bedroom
  • Self-esteem
  • Well-known
  • Mother-in-law
  • Six-year-old
  • Part-time

You can create compound words by combining different parts of speech:

  • Noun + Noun: Toothbrush, firefly
  • Adjective + Noun: Blackboard, greenhouse
  • Verb + Noun: Swimsuit, haircut
  • Noun + Verb: Sun rise, snow fall

Instructions: Combine the following words to form compound words. Write whether they are closed, open or hyphenated.

  1. Sun + flower = ______________
  2. Ice + cream = ______________
  3. Well + being = ______________
  4. Fire + fly = ______________
  5. Post + office = ______________

Instructions: Use the following compound words in a sentence.

  1. Rainbow
  2. Bedroom
  3. Football

In these notes, we learned about compound words. Remember that a compound word is made up of two or more words that join to create a new word with its own meaning. They can be closed, hyphenated, or open. Practice combining words and using compound words in your everyday writing and speaking.

Let’s practice!