redo vs REM, What's the Difference?

Which to use

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

#22,787
“redo” frequency rank: #20,207
“REM” frequency rank: 42994
confusion score

Side-by-Side Comparison

Feature	redo	REM
Definition	To do again.	Initialism of rapid eye movement.

Letter map: redo vs REM

Shared letters muted; letters that set redo and REM apart highlighted. Shared run: 2.

4 ch

redo

3 ch

REM

Grammar separator: redo vs REM

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: redo is averb and REManoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 42994, derived from the frequency rank of both members and their visual similarity.

redo is recorded at frequency rank #22,787, classified as averb, pronounced /ɹiˈduː/. REM is at rank #20,207, tagged as anoun.

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 42994, this pair ranks #244,191 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of redo vs REM

Shared letters: er. Private to "redo": do. Private to "REM": m.

"redo" · 4 letters · shape CVCV · "REM" · 3 letters · shape CVC

Known mistypes of this pair

redo ← erdo · rdeo · reddo · reod · rredo

Frequently Asked Questions

Do "redo" and "REM" mean the same thing in a sentence?

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

In ordinary English text, does "redo" or "REM" show up more?

"REM" is the more common of the two: it sits at frequency rank #20,207 in our English list, against #22,787 for "redo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Done with this confusable. These links stay specific to "redo" and "REM".

Full dictionary entry for "redo" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "REM" - compare definitions side by side with the headword page. Word entry
This pair ranks #244,191 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"redo" and "REM" also get mixed up with nearby pairs, the highest-scored neighbour is "redo vs reedy". 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 #244,191 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.