blue hour
/ˈbluː aʊə/
"blue-hour" is a 8-letter English headword indexed on PlainSpell.
The verdict
“blue hour” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 9
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.
Corpus desk
Index EN-blue-hour · blue hour · English
blue hour · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 9 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "B" 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 | blue hour |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈbluː aʊə/ |
| Letters | 9 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “blue hour” in English
Rare enough to double-check
blue hour is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈbluː aʊə/. Rarity is why readers land here mid-draft. Gloss: "The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.".
Zero misspellings are on record for blue hour in our index, typically a sign the spelling maps closely to how the word sounds. No confusable counterpart is on file for this word, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: Calque of French heure bleue. The correct English form is blue hour, spelled B-L-U-E- -H-O-U-R.
Definition
- 1The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.
Etymology
Calque of French heure bleue.
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.