Keyword vs Key Word Quiz: Test Yourself
Five quick questions on keyword vs key word. Pick an answer to get instant feedback.
Flip Cards: Quick Review
Hover over a card, or tap it on mobile, to see the meaning.
A word used to search, index or tag content.
“Add your main keyword to the title.”
A two-word variant, often meaning an especially important word.
“Underline each key word in the passage.”
A search term made of several words.
“Her keyphrase was running shoes for men.”
A word with special meaning in a programming language.
“Words like if and while are keywords.”
People search for keyword vs key word because both forms look natural, and writers see them used interchangeably online. Dictionaries and style guides lean toward the one-word form, but the two-word version is not an error. This guide explains when each one fits.
| Term | Meaning | Part of speech / Category | Example sentence |
|---|---|---|---|
| Keyword | A word used in search, indexing or tagging; also a word of special significance | Noun / closed compound | “The keyword appears in the page title.” |
| Key word | An especially important word; a two-word variant of keyword | Noun phrase / open compound | “The key word in that sentence is not.” |
| Keyphrase | A multi-word search term | Noun / SEO term | “Use one keyphrase per page.” |
| Keywords | More than one keyword | Noun (plural) | “List the keywords at the top of the abstract.” |
Which is correct: keyword or key word?
Both appear in print, but keyword is the standard spelling in modern use. In technical, digital and SEO writing, the closed form keyword is the norm.
Key word, written as two words, is an accepted variant that you will see in formal prose and older texts. Treat it as a style choice rather than a mistake. The one rule that matters is consistency: don’t use both forms in the same article.
What does keyword mean?
A keyword is a word used to find, index or label information. It can also mean a word of special importance or significance.
It shows up in several areas:
- Search: the word you type into a search engine.
- SEO: the term a page is written to rank for.
- Academic writing: the words listed under an abstract so readers can find the paper.
- Programming: a reserved word with a special meaning, such as if or while.
- Cryptography: historically, a secret word used to encode or decode a cipher.
What does key word mean?
Key word usually means the most important word in a sentence, passage or question. Here “key” works like an adjective meaning “essential,” so the two words read naturally as a phrase.
For example, in an exam question, the key word might be “compare” or “explain,” because it tells you what to do. Writers who prefer the two-word form often use it this way, while keeping keyword for the search sense.
Is keyword one word in SEO and programming?
Yes. In SEO, analytics tools and programming languages, keyword is written as one word. That is the form you will see in tool menus, documentation and code.
If you write for a technical or marketing audience, use keyword. A two-word “key word” may look slightly dated or out of place next to the tools your readers use.
What is the difference between a keyword and a keyphrase?
Strictly speaking, a keyword is a single word, and a keyphrase is a group of words. In practice, many people say keyword for both, so “running shoes for men” is often called a keyword even though it is a phrase.
The distinction matters most in SEO, where early search tools handled single words and modern ones handle full phrases. If you want to be precise, use keyphrase for multi-word terms.
How can you remember keyword vs key word?
Think of keyword as a tech word: it joins up like “password,” “username” and “keyboard.” The memory tricks below give you a quick rule.
Common mistakes with keyword and key word
- ✗ Put the keyword in the title and each key word in the body.
✓ Put the keyword in the title and each keyword in the body. - ✗ Add three key-words to your post.
✓ Add three keywords to your post. - ✗ Choose a keyboard for your article.
✓ Choose a keyword for your article. - ✗ “Key word” is always wrong.
✓ “Key word” is an accepted variant; just be consistent. - ✗ A keyword must be a single word.
✓ Many keywords are really phrases, which some writers call keyphrases.
Memory tricks
- Tech words close up. Keyword joins like password, username and keyboard.
- Search box = keyword. If you type it into a search engine, write it as one word.
- Pick one and stick to it. Consistency matters more than which form you choose.
FAQ: Keyword vs Key Word
Is it keyword or key word?
Both appear in print, but keyword is the standard one-word spelling, especially for search and SEO. Key word is an accepted two-word variant, so pick one and stay consistent.
Which spelling should I use for SEO?
Use keyword as one word. It is the form used in SEO tools, analytics and documentation, and it is what readers expect in marketing and technical writing.
Is key-word with a hyphen correct?
The hyphenated form key-word is uncommon and is not the standard spelling. Use keyword as one word, or key word as two words.
What is the difference between a keyword and a keyphrase?
A keyword is strictly a single word, while a keyphrase is made of several words. In everyday use, many people call both of them keywords.
What does keyword mean in programming?
In programming, a keyword is a reserved word that has a special meaning in the language, such as if or while. You cannot use it as a variable name.
Conclusion
When it comes to keyword vs key word, use keyword as one word for search, SEO and code, and treat key word as an accepted two-word variant. Whichever you choose, use it the same way throughout your writing. Share this with someone who mixes these up.