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What's the word for a word made by combining parts of two other words?

The word you're looking for

A portmanteau is a new word made by joining parts of two other words. It fits your clue exactly, like "smog" from smoke and fog.

Other words that fit

Use this for a simpler, more general term. It is common in linguistics, but less specific than portmanteau.

Use this when two whole words are joined, like "toothbrush" or "notebook." It is different from a portmanteau.

Use this when you mean a newly created word in general. It is broader and does not always mean two words were combined.

Why this word

A portmanteau is a word formed by mixing parts of two other words. English uses this pattern a lot in names, brands, and everyday speech. People sometimes confuse it with a compound word, but a compound usually joins full words, not pieces. The word is common in language study and in examples like "brunch" and "motel."

In context

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Frequently asked questions

Is a portmanteau the same as a compound word?
No. A compound word joins whole words, but a portmanteau joins parts of words.
What is a simple example of a portmanteau?
"Brunch" is a simple example. It comes from breakfast and lunch.
Can a portmanteau be a brand name?
Yes. Many brand names and product names use portmanteau-style word creation.