com vs CPI, What's the Difference?

Which to use

“com” is a preposition and “CPI” is an abbrev - they look or sound alike but fill different roles in a sentence.

#14
“com” frequency rank: #8,173
“CPI” frequency rank: 8187
confusion score

Side-by-Side Comparison

Feature	com	CPI
Definition	indica várias relações: companhia, causa, instrumento, ligação, modo, oposição	Comissão Parlamentar de Inquérito, espécie de investigação conduzida pelo Poder Legislativo

Where the eye mixes com and CPI

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

com

3 ch

CPI

Why the eye confuses com with CPI

These two trip readers on the page rather than in the ear: com is /kõ/ while CPI is /ce.pe.ˈi/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (preposition vs abbrev), which is usually the fastest check. Our composite confusion score for this pair is 8187, derived from the frequency rank of both members and their visual similarity.

com is recorded at frequency rank #14, classified as aprep, pronounced /kõ/. CPI is at rank #8,173, tagged as anabbrev, pronounced /ce.pe.ˈi/.

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 8187, this pair ranks #65,685 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of com vs CPI

Shared letters: c. Private to "com": mo. Private to "CPI": ip.

"com" · 3 letters · shape CVC · "CPI" · 3 letters · shape CCV

Frequently Asked Questions

Is swapping "com" for "CPI" ever safe?

No - they are not even the same part of speech. "com" is a preposition and "CPI" an abbrev, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "com" vs "CPI" - which ranks higher?

"com" is the more common of the two: it sits at frequency rank #14 in our Portuguese list, against #8,173 for "CPI". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

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 "com" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "CPI" - compare definitions side by side with the headword page. Word entry
This pair ranks #65,685 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"com" and "CPI" also get mixed up with nearby pairs, the highest-scored neighbour is "CPI vs cupim". Nearby pair

Confusion rank #65,685 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.