Which to use
“underlining” is a verb and “underpinning” is a noun - they look or sound alike but fill different roles in a sentence.
- #42,468
- “underlining” frequency rank
- #33,896
- “underpinning” frequency rank
- 76364
- confusion score
Side-by-Side Comparison
| Feature | underlining | underpinning |
|---|---|---|
| Definition | present participle and gerund of underline | A support or foundation, especially as a structure of masonry that supports a wall. |
Letter map: underlining vs underpinning
Shared letters muted; letters that set underlining and underpinning apart highlighted. Shared run: 10.
Grammar separator: underlining vs underpinning
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: underlining is averb and underpinninganoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 76364, derived from the frequency rank of both members and their visual similarity.
underlining is recorded at frequency rank #42,468, classified as averb. underpinning is at rank #33,896, tagged as anoun.
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 76364, this pair ranks #30,338 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of underlining vs underpinning
Shared letters: deginru. Private to "underlining": l. Private to "underpinning": p.
"underlining" · 11 letters · shape VCCVCCVCVCC · "underpinning" · 12 letters · shape VCCVCCVCCVCC
Known mistypes of this pair
- underlining ← nuderlining · udnerlining · undderlining · undelrining · underilning · underliinng · underlinign · underliningg
- underpinning ← nuderpinning · udnerpinning · undderpinning · undeprinning · underipnning · underpining · underpininng · underpinnign
Frequently Asked Questions
Do "underlining" and "underpinning" mean the same thing in a sentence?
In ordinary English text, does "underlining" or "underpinning" show up more?
After this comparison
Pair "underlining" vs "underpinning" is on the table, pick a follow-up below.
- Full dictionary entry for "underlining" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "underpinning" - compare definitions side by side with the headword page. Word entry
- This pair ranks #30,338 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "underlining" and "underpinning" also get mixed up with nearby pairs, the highest-scored neighbour is "underlining vs undermining". 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 #30,338 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.