'Mould' vs 'Mold': What's the Difference Between the Two?

By Shanea Patterson, updated on December 30, 2022

Is there ‘mould’ or ‘mold’ in your home? How do you spell it correctly? And what’s the difference between these two words? We’ll cover that and more in this article. You’ll learn the definition and meaning and how to use the correct spelling of the word in a sentence.

The quick answer is that ‘mould’ is the British English spelling of the word, and ‘mold’ is the American English spelling of the word. Which word you use will depend on the audience you’re writing for.

‘Mold’ vs. ‘Mould’ – What’s the Difference?

The difference between ‘mold’ and ‘mould’ is that the former is the American English spelling of the word and ‘mould’ is the British English spelling of the word.

The words mean the exact same thing. They just have different spellings, which is common in the English language.

British English vs. American English

There are quite a few words in the English language that have a British English spelling. Take a look at some examples.

  • Honor > Honour
  • Humor > Humour
  • Color > Colour
  • Analyze > Analyse
  • Flavor > Flavour
  • Realize > Realise

Definition and Meaning of ‘Mold’ and ‘Mould’

The Merriam-Webster definition of ‘mold’ and ‘mould’ is: “a cavity in which a substance is shaped: such as 1) a matrix for casting metal, 2) a form in which food is given a decorative shape,” “a molded object,” “prototype,” “a fixed pattern: design,” “obsolete: an example to be followed,” “distinctive nature or character: type,” “the frame on or around which an object is constructed,” and “molding.”

It also means: “a superficial often wooly growth produced especially on damp or decaying organic matter or on living organisms by a fungus (as of the order Mucorales),” “a fungus that produces mold.”

As a verb, it means: “to knead or work (a material, such as dough or clay) into a desired consistency or shape,” “to form in a mold,” “to determine or influence the quality or nature of,” “to give shape to,” “to fit the contours of,” “to ornament with molding or carving,” and “crumbling soft friable earth suited to plant growth: soil,” “the surface of the earth: ground,” the earth of the burying ground,” and “earth that is the substance of the human body.”

Synonyms of the words include:


  • Break down
  • Decompose
  • Foul
  • Putrefy
  • Corrupt
  • Disintegrate
  • Molder
  • Rot
  • Decay
  • Fester
  • Perish
  • Spoil
  • Earth


  • Clod
  • Dirt
  • Earth
  • Ground
  • Soil

It also means “to become moldy.”

How to Use ‘Mold’ and ‘Mould’ in a Sentence

Now that you know what the words mean let’s take a look at some examples of how to use them in a sentence correctly.

  • We decided to pass on that house because it had too much water mold in the bathroom.
  • I broke the mold and became the first woman to compete in football at my school.
  • There’s a lot of green mold in the garage. We’re going to have to call someone.
  • The inspector told us our home has something called pre-mold. I’ve never heard of it.
  • While we were traveling, our house sitter noticed mold in the guest bedroom.
  • There’s mold on that bread. Throw it out immediately.

Remember that ‘mold’ and ‘mould’ mean the same thing. So, if your audience changes, you can swap the words out for one another.

Final Thoughts on ‘Mould’ and ‘Mold’

Now that you know what the words mean and how to use them in a sentence, you can form some of your own. Use our example sentences as a guide.

Not too confident you’ll remember this? Bookmark the page and come back as often as you need to. Seriously, we don’t judge.

We’ve also got a ton of other content for you to check out, including content on confusing words and phrases that often trip people up (even native English speakers). Go check it out.

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Written By:
Shanea Patterson
Shanea Patterson is a writer based in New York and loves writing for brands big and small. She has a master's degree in professional writing from New York University and a bachelor's degree in English from Mercy College.

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