sich vs sth, What's the Difference?

Which to use

“sich” is a noun and “sth” is a pronoun - they look or sound alike but fill different roles in a sentence.

#42,895
“sich” frequency rank: #40,035
“sth” frequency rank: 82930
confusion score

Side-by-Side Comparison

Feature	sich	sth
Definition	An administrative and military centre for the Zaporozhian and Danube Cossacks.	Abbreviation of something.

Where the spellings diverge

Shared letters are muted; the letters that actually set sich and sth apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

4 ch

sich

3 ch

sth

Spelling & Dictionary Insight

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: sich is anoun and sthapronoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 82930, derived from the frequency rank of both members and their visual similarity.

sich is recorded at frequency rank #42,895, classified as anoun, pronounced /siːt͡ʃ/. sth is at rank #40,035, tagged as apron.

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 82930, this pair ranks #14,806 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of sich vs sth

Shared letters: hs. Private to "sich": ci. Private to "sth": t.

"sich" · 4 letters · shape CVCC · "sth" · 3 letters · shape CCC

Known mistypes of this pair

sich ← isch · scih · sicch · sichh · sihc · ssich

Frequency comparison

sich#42,895

sth#40,035

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sich" and "sth" be used interchangeably?

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

Which is more common, "sich" or "sth"?

"sth" is the more common of the two: it sits at frequency rank #40,035 in our English list, against #42,895 for "sich". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering sich vs sth

The fastest way to pick the right one every time.

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