REM vs rex, What's the Difference?

Which to use

“REM” and “rex” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#35,225
“REM” frequency rank: #13,343
“rex” frequency rank: 48568
confusion score

Side-by-Side Comparison

Feature	REM	rex
Definition	Fase del sueño durante la que suceden los ensueños más intensos. Durante esta fase, los ojos se mueven rápidamente y la actividad de las neuronas del cerebro se asemeja a la de cuando se está despierto.	Rey, monarca.

Where the eye mixes REM and rex

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

3 ch

REM

3 ch

rex

Why the eye confuses REM with rex

A purely visual mix-up. REM ([ˈrẽm]) and rex (/ˈreːks/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - m in “REM” becomes x in “rex”. Our composite confusion score for this pair is 48568, derived from the frequency rank of both members and their visual similarity.

REM is recorded at frequency rank #35,225, classified as anoun, pronounced [ˈrẽm]. rex is at rank #13,343, tagged as anoun, pronounced /ˈreːks/.

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 48568, this pair ranks #113,762 of 323,831 scored Spanish confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of REM vs rex

Shared letters: er. Private to "REM": m. Private to "rex": x.

"REM" · 3 letters · shape CVC · "rex" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "REM" for "rex" ever safe?

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

Frequency check: "REM" vs "rex" - which ranks higher?

"rex" is the more common of the two: it sits at frequency rank #13,343 in our Spanish list, against #35,225 for "REM". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "REM" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "rex" - compare definitions side by side with the headword page. Word entry
This pair ranks #113,762 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"REM" and "rex" also get mixed up with nearby pairs, the highest-scored neighbour is "REM vs rema". Nearby pair

Confusion rank #113,762 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.