sein vs skin, What's the Difference?

Which to use

“sein” is a verb and “skin” is a noun - they look or sound alike but fill different roles in a sentence.

#43,647
“sein” frequency rank: #18,716
“skin” frequency rank: 62363
confusion score

Side-by-Side Comparison

Feature	sein	skin
Definition	ser, estar.	pele

Where the spellings diverge

Shared letters are muted; the letters that actually set sein and skin apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

4 ch

sein

4 ch

skin

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: sein is /zaɪ̯n/ while skin is /ˈskin/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - e in “sein” becomes k in “skin”, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 62363, derived from the frequency rank of both members and their visual similarity.

sein is recorded at frequency rank #43,647, classified as averb, pronounced /zaɪ̯n/. skin is at rank #18,716, tagged as anoun, pronounced /ˈskin/.

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 62363, this pair ranks #6,703 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of sein vs skin

Shared letters: ins. Private to "sein": e. Private to "skin": k.

"sein" · 4 letters · shape CVVC · "skin" · 4 letters · shape CCVC

Known mistypes of this pair

sein ← esin · seinn · seni · sien · ssein
skin ← ksin · sikn · skinn · skkin · skni · sskin

Frequency comparison

sein#43,647

skin#18,716

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sein" and "skin" be used interchangeably?

No - they are not even the same part of speech. "sein" is a verb and "skin" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "sein" or "skin"?

"skin" is the more common of the two: it sits at frequency rank #18,716 in our Portuguese list, against #43,647 for "sein". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering sein vs skin

The fastest way to pick the right one every time.

Check the role first: if you need a verb, it's “sein”; for a noun, it's “skin”.
See each word in full, definition, IPA, etymology and its other confusables. Full “sein” entry
Browse more pairs most likely to be confused. Most confusable