add-on
"add-on" is a 5-letter English headword indexed on PlainSpell.
The verdict
“add-on” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 6
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Something which can be appended to something else.
Corpus desk
Index EN-add-on · add-on · English
add-on · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 6 letters
- VOW-2 2 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "A" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | add-on |
| Language | English |
| Part of speech | Noun |
| Letters | 6 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “add-on” in English
Rare enough to double-check
add-on is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 4 senses are on record.
We couldn't generate a plausible misspelling set for add-on, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: Deverbal from add on. The correct English form is add-on, spelled A-D-D---O-N.
Definition
- 1Something which can be appended to something else.
- 2A software extension or hardware peripheral that provides additional functions or customization for a core application or system.
- 3Additional chips that can be purchased at specific times in tournament play.
- 4Synonym of expansion pack.
Recorded use
Wiktionary examplesThese source excerpts show how add-on appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Payments made before an add-on sale must be allocated entirely to the previous contract or contracts.
Microdrives that can hold several gigabytes (see Figure 2.20) have been available as add-ons for portable devices.
Etymology
Deverbal from add on.
Synonyms
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.