quad vs quasi, What's the Difference?

Which to use

“quad” is a noun and “quasi” is an adjective - they look or sound alike but fill different roles in a sentence.

#11,274
“quad” frequency rank: #15,250
“quasi” frequency rank: 26524
confusion score

Side-by-Side Comparison

Feature	quad	quasi
Definition	Clipping of quadrat.	Resembling or having a likeness to the named thing.

Where the spellings diverge

Shared letters are muted; the letters that actually set quad and quasi apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

4 ch

quad

5 ch

quasi

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: quad is /kwɑd/ while quasi is /ˈkweɪzaɪ/. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 26524, derived from the frequency rank of both members and their visual similarity.

quad is recorded at frequency rank #11,274, classified as anoun, pronounced /kwɑd/. quasi is at rank #15,250, tagged as anadj, pronounced /ˈkweɪzaɪ/.

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 26524, this pair ranks #386,044 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of quad vs quasi

Shared letters: aqu. Private to "quad": d. Private to "quasi": is.

"quad" · 4 letters · shape CVVC · "quasi" · 5 letters · shape CVVCV

Known mistypes of this pair

quad ← qaud · qquad · quadd · quda · uqad
quasi ← qausi · qquasi · quais · quassi · qusai · uqasi

Frequency comparison

quad#11,274

quasi#15,250

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "quad" and "quasi" be used interchangeably?

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

Which is more common, "quad" or "quasi"?

"quad" is the more common of the two: it sits at frequency rank #11,274 in our English list, against #15,250 for "quasi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering quad vs quasi

The fastest way to pick the right one every time.

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