rad vs run, What's the Difference?

Which to use

“rad” is an adjective and “run” is a verb - they look or sound alike but fill different roles in a sentence.

#15,039
“rad” frequency rank: #309
“run” frequency rank: 15348
confusion score

Side-by-Side Comparison

Feature	rad	run
Definition	Clipping of radical (“excellent”).	To move swiftly.

Where the eye mixes rad and run

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

3 ch

rad

3 ch

run

Visual trap between rad and run

These two trip readers on the page rather than in the ear: rad is /ɹæd/ while run is /ɹʌn/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs verb), which is usually the fastest check. Our composite confusion score for this pair is 15348, derived from the frequency rank of both members and their visual similarity.

rad is recorded at frequency rank #15,039, classified as anadj, pronounced /ɹæd/. run is at rank #309, tagged as averb, pronounced /ɹʌn/.

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 15348, this pair ranks #464,501 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of rad vs run

Shared letters: r. Private to "rad": ad. Private to "run": nu.

"rad" · 3 letters · shape CVC · "run" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "rad" for "run" ever safe?

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

Which is more common, "rad" or "run"?

"run" is the more common of the two: it sits at frequency rank #309 in our English list, against #15,039 for "rad". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "rad" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "run" - compare definitions side by side with the headword page. Word entry
This pair ranks #464,501 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"rad" and "run" also get mixed up with nearby pairs, the highest-scored neighbour is "rad vs Rua". Nearby pair

Confusion rank #464,501 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.