Which to use
“infect” and “invest” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #18,109
- “infect” frequency rank
- #4,167
- “invest” frequency rank
- 22276
- confusion score
Side-by-Side Comparison
| Feature | infect | invest |
|---|---|---|
| Definition | To bring (the body or part of it) into contact with a substance that causes illness (a pathogen), so that the pathogen begins to act on the body; (of a pathogen) to come into contact with (a body or body part) and begin to act on it. | To spend money, time, or energy on something, especially for some benefit or purpose; used with in. |
Where the eye mixes infect and invest
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. infect and invest follow the identical consonant-vowel pattern (VCCVCC). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between infect and invest
A purely visual mix-up. infect (/ɪnˈfɛkt/) and invest (/ɪnˈvɛst/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 22276, derived from the frequency rank of both members and their visual similarity.
infect is recorded at frequency rank #18,109, classified as averb, pronounced /ɪnˈfɛkt/. invest is at rank #4,167, tagged as averb, pronounced /ɪnˈvɛst/.
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 22276, this pair ranks #417,787 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of infect vs invest
Shared letters: eint. Private to "infect": cf. Private to "invest": sv.
"infect" · 6 letters · shape VCCVCC · "invest" · 6 letters · shape VCCVCC
Known mistypes of this pair
Frequently Asked Questions
Do "infect" and "invest" mean the same thing in a sentence?
In ordinary English text, does "infect" or "invest" show up more?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "infect" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "invest" - compare definitions side by side with the headword page. Word entry
- This pair ranks #417,787 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "infect" and "invest" also get mixed up with nearby pairs, the highest-scored neighbour is "infect vs invert". 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 #417,787 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.