Which to use
“underage” is an adjective and “undergo” is a verb - they look or sound alike but fill different roles in a sentence.
- #15,727
- “underage” frequency rank
- #9,552
- “undergo” frequency rank
- 25279
- confusion score
Side-by-Side Comparison
| Feature | underage | undergo |
|---|---|---|
| Definition | Below the legal age (usually age 18) for some activity, such as consuming alcohol or engaging in sexual intercourse. | To experience; to pass through a phase. |
Where the eye mixes underage and undergo
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. underage runs 8 letters (VCCVCVCV) against undergo's 7 (VCCVCCV) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: underage vs undergo
These two trip readers on the page rather than in the ear: underage is /ˌʌndəɹˈeɪd͡ʒ/ while undergo is /ˌʌndɚˈɡoʊ/. 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 (adjective vs verb), which is usually the fastest check. Our composite confusion score for this pair is 25279, derived from the frequency rank of both members and their visual similarity.
underage is recorded at frequency rank #15,727, classified as anadj, pronounced /ˌʌndəɹˈeɪd͡ʒ/. undergo is at rank #9,552, tagged as averb, pronounced /ˌʌndɚˈɡoʊ/.
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 25279, this pair ranks #395,524 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of underage vs undergo
Shared letters: degnru. Private to "underage": a. Private to "undergo": o.
"underage" · 8 letters · shape VCCVCVCV · "undergo" · 7 letters · shape VCCVCCV
Known mistypes of this pair
Frequently Asked Questions
Can "underage" and "undergo" be used interchangeably?
In ordinary English text, does "underage" or "undergo" show up more?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "underage" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "undergo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #395,524 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "underage" and "undergo" also get mixed up with nearby pairs, the highest-scored neighbour is "underage vs underlie". 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 #395,524 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.