sic vs sub, What's the Difference?

Which to use

“sic” is an adverb and “sub” is a noun - they look or sound alike but fill different roles in a sentence.

#12,684
“sic” frequency rank: #2,236
“sub” frequency rank: 14920
confusion score

Side-by-Side Comparison

Feature	sic	sub
Definition	Thus; as written; used to indicate, for example, that text is being quoted as it is from the source.	Abbreviation of submarine.

Where the eye mixes sic and sub

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

3 ch

sic

3 ch

sub

Look-alike desk: sic vs sub

These two trip readers on the page rather than in the ear: sic is /sɪk/ while sub is /sʌb/. 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 (adverb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 14920, derived from the frequency rank of both members and their visual similarity.

sic is recorded at frequency rank #12,684, classified as anadv, pronounced /sɪk/. sub is at rank #2,236, tagged as anoun, pronounced /sʌb/.

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 14920, this pair ranks #467,138 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of sic vs sub

Shared letters: s. Private to "sic": ci. Private to "sub": bu.

"sic" · 3 letters · shape CVC · "sub" · 3 letters · shape CVC

Frequently Asked Questions

Do "sic" and "sub" mean the same thing in a sentence?

No - they are not even the same part of speech. "sic" is an adverb and "sub" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "sic" or "sub"?

"sub" is the more common of the two: it sits at frequency rank #2,236 in our English list, against #12,684 for "sic". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "sic" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sub" - compare definitions side by side with the headword page. Word entry
This pair ranks #467,138 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"sic" and "sub" also get mixed up with nearby pairs, the highest-scored neighbour is "sic vs Sif". Nearby pair

Confusion rank #467,138 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.