sevssobWhat's the difference?

Quick tell: se is a conjunction, sob is a preposition, so they fill different roles in a sentence.

Which to use

“se” is a conjunction and “sob” is a preposition - they look or sound alike but fill different roles in a sentence.

#16
“se” frequency rank
#320
“sob” frequency rank
336
confusion score

Side-by-Side Comparison

Feature se sob
Definition indica hipótese abaixo, em baixo

Where the eye mixes se and sob

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

2 ch
se
3 ch
sob

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: se is /sɨ/ while sob is /ˈsob/. 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 (conjunction vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 336, derived from the frequency rank of both members and their visual similarity.

se is recorded at frequency rank #16, classified as aconj, pronounced /sɨ/. sob is at rank #320, tagged as aprep, pronounced /ˈsob/.

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 336, this pair ranks #75,299 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of se vs sob

Shared letters: s. Private to "se": e. Private to "sob": bo.

"se" · 2 letters · shape CV  ·  "sob" · 3 letters · shape CVC

Frequently Asked Questions

Can "se" and "sob" be used interchangeably?
No - they are not even the same part of speech. "se" is a conjunction and "sob" a preposition, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "se" or "sob"?
"se" is the more common of the two: it sits at frequency rank #16 in our Portuguese list, against #320 for "sob". 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