thermos
/ˈθɜː.mɒs/
"thermos" is a 7-letter English headword indexed on PlainSpell.
The verdict
“thermos” has 11 generated spelling variants in the English index at frequency #44,527. The variants make it a useful spelling check.
- #44,527
- frequency rank, English
- 3,151
- “T” headwords
- 11
- tracked misspellings
- 7
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents
Corpus desk
Index EN-thermos · thermos · English
thermos · rank #44,527 · 11 variants · 7 confusables
- FREQ-MID #44,527
- LEN-LONG 7 letters
- VOW-2 2 vowels
- CONFUS-MID 7 pairs
- VAR-MID 11 variants
- BOOK-MID 3,151
- PHOTO-FINISH thereabouts
Nearest frequency peer: thereabouts (-1 rank slots)
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.
Rank peers near misspelling magnet “thermos”
Same rarity band: useful when a typo lands on a peer headword
- Teixeira
Teixeira
55,478 corpus weight
- Teton
Teton
55,476 corpus weight
- thereabouts
thereabouts
55,475 corpus weight
- thermos
thermos
55,474 corpus weight
- thrasher
thrasher
55,473 corpus weight
- tine
tine
55,471 corpus weight
What this shows “thermos” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | thermos |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈθɜː.mɒs/ |
| Letters | 7 |
| Frequency rank | #44,527 |
| Misspellings tracked | 11 |
| Confusable pairs | 7 |
| Source | Wiktionary (kaikki.org) |
Frequency seat of misspelling magnet “thermos”
A misspelling magnet
The generator records 11 spelling variants around thermos (IPA /ˈθɜː.mɒs/), anoun. Corpus frequency is #44,527 among 3,151 “T” headwords. Dominant gloss: "A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents".
Our generated misspelling index lists 11 likely wrong-spelling variants for thermos, with forms such as "htermos", "tehrmos", and "themros". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 7 confusable-pair relationships, "Theron", "terms", "theres", and more, where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: Genericization of the trademark Thermos, from Ancient Greek θερμός (thermós, “warm”). Possibly related to English warm. The correct English form is thermos, spelled T-H-E-R-M-O-S.
Definition
- 1A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents
Etymology
Genericization of the trademark Thermos, from Ancient Greek θερμός (thermós, “warm”). Possibly related to English warm.
Synonyms
This word in other languages
Common misspellings
Also misspelled as:
- htermos
- tehrmos
- themros
- thermmos
- thermoss
- thermso
- theroms
- therrmos
- thhermos
- thremos
- tthermos
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of thermos - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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
How do you spell "thermos"?
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "thermos", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 7 letters (nearest by frequency rank).
Similar misspelling depth
Headwords with a similar count of attested misspellings (11 here; floor ≥5).