lactase
"lactase" is a 7-letter English headword indexed on PlainSpell.
The verdict
“lactase” is uncommon English (frequency #79,689 among 2,297 “L” headwords), classed as a noun. The kind of spelling people second-guess.
- #79,689
- frequency rank, English
- 2,297
- “L” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A β-galactosidase enzyme that is involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers.
Corpus desk
Index EN-lactase · lactase · English
lactase · rank #79,689 · 0 variants · 0 confusables
- FREQ-RARE #79,689
- LEN-LONG 7 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 2,297
- PHOTO-FINISH Lacombe
Nearest frequency peer: Lacombe (-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.
Long-tail ranks near “lactase”
Sparse band: bars invert rank so rarer forms read shorter
- Kumamoto
Kumamoto
20,317 corpus weight
- Kumiko
Kumiko
20,315 corpus weight
- Lacombe
Lacombe
20,313 corpus weight
- lactase
lactase
20,312 corpus weight
- lacustrine
lacustrine
20,311 corpus weight
- lancing
lancing
20,308 corpus weight
What this shows Long-tail view: where “lactase” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | lactase |
| Language | English |
| Part of speech | Noun |
| Letters | 7 |
| Frequency rank | #79,689 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “lactase” in English
Rare enough to double-check
lactase is uncommon English at frequency #79,689 among 2,297 “L” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "A β-galactosidase enzyme that is involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers.".
Zero misspellings are on record for lactase in our index, since its letter pattern doesn't lend itself to common typo substitutions. We don't track a confusable pairing for this entry, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From lacto- + -ase. The correct English form is lactase, spelled L-A-C-T-A-S-E.
Definition
- 1A β-galactosidase enzyme that is involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers.
Etymology
From lacto- + -ase.
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "lactase", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 7 letters (nearest by frequency rank).