cob vs cup, What's the Difference?

Which to use

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

#27,404
“cob” frequency rank: #805
“cup” frequency rank: 28209
confusion score

Side-by-Side Comparison

Feature	cob	cup
Definition	A corncob.	A concave vessel for drinking, usually made of opaque material (as opposed to a glass) and with a handle.

Where the eye mixes cob and cup

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

3 ch

cob

3 ch

cup

Visual trap between cob and cup

A purely visual mix-up. cob (/kɑb/) and cup (/kʌp/) 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 28209, derived from the frequency rank of both members and their visual similarity.

cob is recorded at frequency rank #27,404, classified as anoun, pronounced /kɑb/. cup is at rank #805, tagged as anoun, pronounced /kʌp/.

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 28209, this pair ranks #372,869 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of cob vs cup

Shared letters: c. Private to "cob": bo. Private to "cup": pu.

"cob" · 3 letters · shape CVC · "cup" · 3 letters · shape CVC

Frequently Asked Questions

Do "cob" and "cup" mean the same thing in a sentence?

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

Which is more common, "cob" or "cup"?

"cup" is the more common of the two: it sits at frequency rank #805 in our English list, against #27,404 for "cob". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

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

Full dictionary entry for "cob" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "cup" - compare definitions side by side with the headword page. Word entry
This pair ranks #372,869 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"cob" and "cup" also get mixed up with nearby pairs, the highest-scored neighbour is "CGT vs cob". Nearby pair

Confusion rank #372,869 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.