substratum
/səbˈstrɑ.təm/
"substratum" is a 10-letter English headword indexed on PlainSpell.
The verdict
“substratum” is an uncommon English word, ranked #72,796 in English word frequency and used as a noun.
- #72,796
- frequency rank, English
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A layer that lies underneath another.
| Property | Value |
|---|---|
| Headword | substratum |
| Language | English |
| Part of speech | Noun |
| IPA | /səbˈstrɑ.təm/ |
| Letters | 10 |
| Frequency rank | #72,796 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “substratum” sits in English frequency
Spelling & Dictionary Insight
The English entry for substratum is 10 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /səbˈstrɑ.təm/. Corpus data places it at rank #72,796 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.
No generated misspelling entries exist for substratum in our index, which points to an orthography that plays by predictable English rules. No close-neighbour confusable shows up for this headword in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: Learned borrowing from New Latin substrātum, nominalisation of the neuter of Latin substrātus, perfect passive participle of substernō. By surface analysis, sub- + stratum. The correct English form is substratum, spelled S-U-B-S-T-R-A-T-U-M.
Definition
- 1A layer that lies underneath another.
- 2The underlying cause or basis of something.
- 3A substrate.
Etymology
Learned borrowing from New Latin substrātum, nominalisation of the neuter of Latin substrātus, perfect passive participle of substernō. By surface analysis, sub- + stratum.
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 “substratum”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-U-B-S-T-R-A-T-U-M - every other letter order is a misspelling in standard orthography.
- Say it as /səbˈstrɑ.təm/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
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.