unused vs used, What's the Difference?

Which to use

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

#12,346
“unused” frequency rank: #156
“used” frequency rank: 12502
confusion score

Side-by-Side Comparison

Feature	unused	used
Definition	Not used.	simple past and past participle of use

Where the spellings diverge

Shared letters are muted; the letters that actually set unused and used apart are highlighted. They share 4 letters in sequence, which is exactly why the eye skips the difference.

6 ch

unused

4 ch

used

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: unused is /ʌnˈjuːzd/ while used is /juːzd/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “used” sits inside “unused”, and the parts of speech differ too (adjective vs verb), which is usually the fastest check. Our composite confusion score for this pair is 12502, derived from the frequency rank of both members and their visual similarity.

unused is recorded at frequency rank #12,346, classified as anadj, pronounced /ʌnˈjuːzd/. used is at rank #156, tagged as averb, pronounced /juːzd/.

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 12502, this pair ranks #481,198 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of unused vs used

Shared letters: desu. Private to "unused": n. Private to "used": -.

"unused" · 6 letters · shape VCVCVC · "used" · 4 letters · shape VCVC

Known mistypes of this pair

unused ← nuused · unnused · unsued · unuesd · unusde · unusedd · unussed · uunsed
used ← uesd · usde · usedd · ussed

Frequency comparison

unused#12,346

used#156

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "unused" and "used" be used interchangeably?

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

Which is more common, "unused" or "used"?

"used" is the more common of the two: it sits at frequency rank #156 in our English list, against #12,346 for "unused". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Remembering unused vs used

The fastest way to pick the right one every time.

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