Which to use
“their” is a determiner and “Theo” is a name - they look or sound alike but fill different roles in a sentence.
- #56
- “their” frequency rank
- #11,987
- “Theo” frequency rank
- 12043
- confusion score
Side-by-Side Comparison
| Feature | their | Theo |
|---|---|---|
| Definition | Belonging to, from, of, or relating to, them (plural). | A male given name from Ancient Greek and nickname. |
Where the eye mixes their and Theo
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. their runs 5 letters (CCVVC) against Theo's 4 (CCVV) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: their vs Theo
These two trip readers on the page rather than in the ear: their is /ðɛə/ while Theo is /ˈθiːəʊ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (determiner vs name), which is usually the fastest check. Our composite confusion score for this pair is 12043, derived from the frequency rank of both members and their visual similarity.
their is recorded at frequency rank #56, classified as adet, pronounced /ðɛə/. Theo is at rank #11,987, tagged as aname, pronounced /ˈθiːəʊ/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 12043, this pair ranks #483,751 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of their vs Theo
Shared letters: eht. Private to "their": ir. Private to "Theo": o.
"their" · 5 letters · shape CCVVC · "Theo" · 4 letters · shape CCVV
Known mistypes of this pair
Frequently Asked Questions
Do "their" and "Theo" mean the same thing in a sentence?
In ordinary English text, does "their" or "Theo" show up more?
After this comparison
Eye-level mix-up between "their" and "Theo" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "their" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "Theo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #483,751 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "their" and "Theo" also get mixed up with nearby pairs, the highest-scored neighbour is "Theo vs Thun". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #483,751 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.