umvsunoWhat's the difference?

Quick tell: um is a article, uno is an adjective, so they fill different roles in a sentence.

Which to use

“um” is an article and “uno” is an adjective - they look or sound alike but fill different roles in a sentence.

#12
“um” frequency rank
#11,761
“uno” frequency rank
11773
confusion score

Side-by-Side Comparison

Feature um uno
Definition qualquer único

Where the eye mixes um and uno

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

2 ch
um
3 ch
uno

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: um is /ũw/ while uno is /ˈunu/. 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 (article vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 11773, derived from the frequency rank of both members and their visual similarity.

um is recorded at frequency rank #12, classified as anarticle, pronounced /ũw/. uno is at rank #11,761, tagged as anadj, pronounced /ˈunu/.

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 11773, this pair ranks #61,004 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of um vs uno

Shared letters: u. Private to "um": m. Private to "uno": no.

"um" · 2 letters · shape VC  ·  "uno" · 3 letters · shape VCV

Frequently Asked Questions

Can "um" and "uno" be used interchangeably?
No - they are not even the same part of speech. "um" is an article and "uno" an adjective, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "um" or "uno"?
"um" is the more common of the two: it sits at frequency rank #12 in our Portuguese list, against #11,761 for "uno". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

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

Source: FrequencyWords open word-frequency list