sig vs sky, What's the Difference?

Which to use

“sig” and “sky” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#20,497
“sig” frequency rank: #1,968
“sky” frequency rank: 22465
confusion score

Side-by-Side Comparison

Feature	sig	sky
Definition	A signature, especially one on emails or newsgroup postings.	The atmosphere above a given point, especially as visible from the surface of the Earth as the place where the sun, moon, stars, and clouds are seen.

Where the eye mixes sig and sky

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

3 ch

sig

3 ch

sky

Visual trap between sig and sky

A purely visual mix-up. sig (/sɪɡ/) and sky (/skaɪ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 22465, derived from the frequency rank of both members and their visual similarity.

sig is recorded at frequency rank #20,497, classified as anoun, pronounced /sɪɡ/. sky is at rank #1,968, tagged as anoun, pronounced /skaɪ/.

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 22465, this pair ranks #416,383 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of sig vs sky

Shared letters: s. Private to "sig": gi. Private to "sky": ky.

"sig" · 3 letters · shape CVC · "sky" · 3 letters · shape CCV

Frequently Asked Questions

Is swapping "sig" for "sky" ever safe?

No. They are said differently (/sɪɡ/ versus /skaɪ/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "sig" or "sky"?

"sky" is the more common of the two: it sits at frequency rank #1,968 in our English list, against #20,497 for "sig". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "sig" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sky" - compare definitions side by side with the headword page. Word entry
This pair ranks #416,383 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"sig" and "sky" also get mixed up with nearby pairs, the highest-scored neighbour is "Sif vs sig". Nearby pair

Confusion rank #416,383 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.