subdomain
"subdomain" is a 9-letter English headword indexed on PlainSpell.
The verdict
“subdomain” is uncommon English (frequency #86,804 among 54,294 “S” headwords), classed as a noun. The kind of spelling people second-guess.
- #86,804
- frequency rank, English
- 54,294
- “S” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A domain or sphere that is part of a larger domain or sphere.
| Property | Value |
|---|---|
| Headword | subdomain |
| Language | English |
| Part of speech | Noun |
| Letters | 9 |
| Frequency rank | #86,804 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “subdomain” sits in English frequency
Rare enough to double-check
subdomain is uncommon English at frequency #86,804 among 54,294 “S” headwords, classed as anoun. Rarity is why readers land here mid-draft. 3 senses are on record.
Zero misspellings are on record for subdomain in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: From sub- + domain. The correct English form is subdomain, spelled S-U-B-D-O-M-A-I-N.
Definition
- 1A domain or sphere that is part of a larger domain or sphere.
- 2A domain name that has been prefaced with additional parts separated with periods.
- 3An additional part prefaced to a domain name.
Etymology
From sub- + domain.
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); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “subdomain”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-U-B-D-O-M-A-I-N - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.