Odd One Out questions appear in many forms of 11+ and selective-school verbal reasoning practice. The basic instruction is simple: identify the word or pair that does not belong with the others.
At a stronger 11+ level, however, the relationship may not be obvious at first glance. Children may need to understand all five words before they can see what four of them have in common.
Try the Odd One Out Mock
Practise seven different vocabulary-based Odd One Out formats.
Start your free mock examThe 7 Ways Examiners Test the "Odd One Out"
Odd One Out is not a single vocabulary skill. Our Exam Hall pack uses several different relationships so children have to think about what the words actually mean and how they behave.
1. Synonym Groups
Four words share a close meaning and one does not. For example, remote, distant, isolated and secluded all suggest being far away or separated, while imprecise means not exact. Children need to know the vocabulary rather than simply spot which word looks different.
2. Word Classes (Grammar Traps)
Four options may share the same grammatical structure while one behaves differently. For example, four phrases might use an adjective followed by a noun, while the fifth uses an adverb followed by an adjective. The difference comes from how the words are being used, not from an obvious spelling clue.
3. Vocabulary Categories
Four words can belong to the same meaning-based vocabulary group while one sits outside it. Useful examples include colours, ways of speaking, types of movement, emotions, landscape words or words describing sound. The challenge should come from understanding the words, not from unrelated general knowledge.
4. Prefixes and Roots
Some questions test meaningful word-building patterns. For example, subterranean, subcutaneous, subaquatic and subzero all use sub- with the idea of under or below, while substantial only happens to begin with the same letters. Knowing the meanings prevents children from relying on appearance alone.
5. Meaning Relationships
Four words may share a particular quality without being direct synonyms. For example, whisper, murmur, mutter and mumble are all quiet ways of speaking, while shriek is loud. These questions test shades of meaning as well as basic definitions.
6. Usage and Collocation
Sometimes the relationship is about how a word is naturally used. A question might ask which word would not normally describe a person's voice, behaviour, movement or expression. For example, husky, shrill, resonant and tremulous can all describe a voice, while torrential normally cannot.
7. Word-Pair Relationships
Instead of five single words, the options may be five pairs. Four pairs share the same relationship and one differs. For example, four might be antonym pairs while the fifth contains two words with similar meanings. Children therefore need to understand both words in each pair before comparing the relationships.
Free Practice Example: The Word Class Trap
Let's look at a grammatical Odd One Out question. Try this with your child:
Which of these phrases is the odd one out?
- A) Grave concern
- B) Sheer delight
- C) Utter nonsense
- D) Fast asleep
- E) Mutual respect
Answer: D) Fast asleep.
Why children get this wrong: Grave concern, sheer delight, utter nonsense and mutual respect all use an adjective + noun. Fast asleep uses an adverb + adjective. The phrases look similar, so the child has to examine how the words are actually being used.
How to Practise Properly
Odd One Out becomes more useful when children practise a mixture of relationships rather than repeatedly answering the same simple category question.
In the 11+ Vocab Trainer Exam Hall, the Odd One Out pack draws from a varied question bank covering synonym groups, vocabulary categories, meaning relationships, word classes, word-building patterns, usage and word-pair relationships.
If your child answers a question incorrectly, our "Practise Mistakes" feature can bring that question back for revision. Short, child-friendly explanations show what the four matching options have in common and why the remaining option is different.