Which to use
“underlining” is a verb and “underlying” is an adjective - they look or sound alike but fill different roles in a sentence.
- #42,468
- “underlining” frequency rank
- #5,464
- “underlying” frequency rank
- 47932
- confusion score
Side-by-Side Comparison
| Feature | underlining | underlying |
|---|---|---|
| Definition | present participle and gerund of underline | lying underneath |
Letter map: underlining vs underlying
Shared letters muted; letters that set underlining and underlying apart highlighted. Shared run: 9.
Role in the sentence - underlining and underlying
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: underlining is averb and underlyinganadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 47932, derived from the frequency rank of both members and their visual similarity.
underlining is recorded at frequency rank #42,468, classified as averb. underlying is at rank #5,464, tagged as anadj.
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 47932, this pair ranks #197,835 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of underlining vs underlying
Shared letters: degilnru. Private to "underlining": -. Private to "underlying": y.
"underlining" · 11 letters · shape VCCVCCVCVCC · "underlying" · 10 letters · shape VCCVCCVVCC
Known mistypes of this pair
- underlining ← nuderlining · udnerlining · undderlining · undelrining · underilning · underliinng · underlinign · underliningg
- underlying ← nuderlying · udnerlying · undderlying · undelrying · underliyng · underllying · underlyign · underlyingg
Frequently Asked Questions
Do "underlining" and "underlying" mean the same thing in a sentence?
Which is more common, "underlining" or "underlying"?
What to do next
Done with this confusable. These links stay specific to "underlining" and "underlying".
- Full dictionary entry for "underlining" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "underlying" - compare definitions side by side with the headword page. Word entry
- This pair ranks #197,835 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "underlining" and "underlying" also get mixed up with nearby pairs, the highest-scored neighbour is "underlining vs underpinning". 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 #197,835 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.