alter vs alto, What's the Difference?

Which to use

“alter” is a pronoun and “alto” is an adjective - they look or sound alike but fill different roles in a sentence.

#23,189
“alter” frequency rank: #516
“alto” frequency rank: 23705
confusion score

Side-by-Side Comparison

Feature	alter	alto
Definition	outro (dentre dois)	de muita estatura

Letter map: alter vs alto

Shared letters muted; letters that set alter and alto apart highlighted. Shared run: 3.

5 ch

alter

4 ch

alto

Role in the sentence - alter and alto

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: alter is apronoun and altoanadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 23705, derived from the frequency rank of both members and their visual similarity.

alter is recorded at frequency rank #23,189, classified as apron. alto is at rank #516, tagged as anadj, pronounced /ˈaɫ.tu/.

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 23705, this pair ranks #46,076 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of alter vs alto

Shared letters: alt. Private to "alter": er. Private to "alto": o.

"alter" · 5 letters · shape VCCVC · "alto" · 4 letters · shape VCCV

Known mistypes of this pair

alter ← aletr · allter · alterr · altre · altter · atler
alto ← allto · alot · altto · atlo

Frequently Asked Questions

Can "alter" and "alto" be used interchangeably?

No - they are not even the same part of speech. "alter" is a pronoun and "alto" an adjective, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "alter" vs "alto" - which ranks higher?

"alto" is the more common of the two: it sits at frequency rank #516 in our Portuguese list, against #23,189 for "alter". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "alter" vs "alto" is on the table, pick a follow-up below.

Full dictionary entry for "alter" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "alto" - compare definitions side by side with the headword page. Word entry
This pair ranks #46,076 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"alter" and "alto" also get mixed up with nearby pairs, the highest-scored neighbour is "alles vs alter". 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 #46,076 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.