intovsisoWhat's the difference?

Quick tell: into is a preposition, iso is a noun, so they fill different roles in a sentence.

Which to use

“into” is a preposition and “iso” is a noun - they look or sound alike but fill different roles in a sentence.

#83
“into” frequency rank
#9,771
“iso” frequency rank
9854
confusion score

Side-by-Side Comparison

Feature into iso
Definition To or towards the inside of. Clipping of isolation.

Where the eye mixes into and iso

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
into
3 ch
iso

Why the eye confuses into with iso

These two trip readers on the page rather than in the ear: into is /ˈɪn.tuː/ while iso is /ˈaɪsəʊ/. 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 (preposition vs noun), which is usually the fastest check. Our composite confusion score for this pair is 9854, derived from the frequency rank of both members and their visual similarity.

into is recorded at frequency rank #83, classified as aprep, pronounced /ˈɪn.tuː/. iso is at rank #9,771, tagged as anoun, pronounced /ˈaɪsəʊ/.

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 9854, this pair ranks #495,243 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of into vs iso

Shared letters: io. Private to "into": nt. Private to "iso": s.

"into" · 4 letters · shape VCCV  ·  "iso" · 3 letters · shape VCV

Known mistypes of this pair

  • intoinnto · inot · intto · itno · nito

Frequently Asked Questions

Can "into" and "iso" be used interchangeably?
No - they are not even the same part of speech. "into" is a preposition and "iso" a noun, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "into" or "iso"?
"into" is the more common of the two: it sits at frequency rank #83 in our English list, against #9,771 for "iso". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "into" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "iso" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #495,243 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "into" and "iso" also get mixed up with nearby pairs, the highest-scored neighbour is "iso vs ith". 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 #495,243 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list