spun vs sub, What's the Difference?

Which to use

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

#11,799
“spun” frequency rank: #2,236
“sub” frequency rank: 14035
confusion score

Side-by-Side Comparison

Feature	spun	sub
Definition	simple past and past participle of spin	Abbreviation of submarine.

Where the eye mixes spun and sub

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch

spun

3 ch

sub

Look-alike desk: spun vs sub

These two trip readers on the page rather than in the ear: spun is /spʌn/ while sub is /sʌb/. 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 (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 14035, derived from the frequency rank of both members and their visual similarity.

spun is recorded at frequency rank #11,799, classified as averb, pronounced /spʌn/. 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 14035, this pair ranks #472,439 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of spun vs sub

Shared letters: su. Private to "spun": np. Private to "sub": b.

"spun" · 4 letters · shape CCVC · "sub" · 3 letters · shape CVC

Known mistypes of this pair

spun ← psun · spnu · sppun · spunn · sspun · supn

Frequently Asked Questions

Is swapping "spun" for "sub" ever safe?

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

Frequency check: "spun" vs "sub" - which ranks higher?

"sub" is the more common of the two: it sits at frequency rank #2,236 in our English list, against #11,799 for "spun". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Eye-level mix-up between "spun" and "sub" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "spun" 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 #472,439 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"spun" and "sub" also get mixed up with nearby pairs, the highest-scored neighbour is "spiny vs spun". Nearby pair
Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #472,439 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.