Which to use
“thumb” and “tum” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #7,071
- “thumb” frequency rank
- #26,641
- “tum” frequency rank
- 33712
- confusion score
Side-by-Side Comparison
| Feature | thumb | tum |
|---|---|---|
| Definition | The shortest and thickest digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers. | shortened form of tummy |
Where the eye mixes thumb and tum
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Why the eye confuses thumb with tum
A purely visual mix-up. thumb (/θʌm/) and tum (/tʌm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 letter(s) in length. Our composite confusion score for this pair is 33712, derived from the frequency rank of both members and their visual similarity.
thumb is recorded at frequency rank #7,071, classified as anoun, pronounced /θʌm/. tum is at rank #26,641, tagged as anoun, pronounced /tʌm/.
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 33712, this pair ranks #327,037 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of thumb vs tum
Shared letters: mtu. Private to "thumb": bh. Private to "tum": -.
"thumb" · 5 letters · shape CCVCC · "tum" · 3 letters · shape CVC
Known mistypes of this pair
- thumb ← htumb · thhumb · thmub · thubm · thumbb · thummb · tthumb · tuhmb
Frequently Asked Questions
Can "thumb" and "tum" be used interchangeably?
Frequency check: "thumb" vs "tum" - which ranks higher?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "thumb" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "tum" - compare definitions side by side with the headword page. Word entry
- This pair ranks #327,037 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "thumb" and "tum" also get mixed up with nearby pairs, the highest-scored neighbour is "tuft vs tum". 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 #327,037 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.