Which to use
“infra” is an adverb and “IRA” is a noun - they look or sound alike but fill different roles in a sentence.
- #32,864
- “infra” frequency rank
- #9,057
- “IRA” frequency rank
- 41921
- confusion score
Side-by-Side Comparison
| Feature | infra | IRA |
|---|---|---|
| Definition | Discussed later. | Initialism of individual retirement account. |
Where the eye mixes infra and IRA
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. infra runs 5 letters (VCCCV) against IRA's 3 (VCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses infra with IRA
These two trip readers on the page rather than in the ear: infra is /ˈɪn.fɹə/ while IRA is /aɪ ɑɹ eɪ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (adverb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 41921, derived from the frequency rank of both members and their visual similarity.
infra is recorded at frequency rank #32,864, classified as anadv, pronounced /ˈɪn.fɹə/. IRA is at rank #9,057, tagged as anoun, pronounced /aɪ ɑɹ eɪ/.
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 41921, this pair ranks #253,925 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of infra vs IRA
Shared letters: air. Private to "infra": fn. Private to "IRA": -.
"infra" · 5 letters · shape VCCCV · "IRA" · 3 letters · shape VCV
Known mistypes of this pair
- infra ← ifnra · infar · inffra · infrra · innfra · inrfa · nifra
Frequently Asked Questions
Do "infra" and "IRA" mean the same thing in a sentence?
Which is more common, "infra" or "IRA"?
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 "infra" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "IRA" - compare definitions side by side with the headword page. Word entry
- This pair ranks #253,925 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "infra" and "IRA" also get mixed up with nearby pairs, the highest-scored neighbour is "infra vs inna". 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 #253,925 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.