IDF
"idf" is a 3-letter English headword indexed on PlainSpell.
The verdict
“IDF” sits in 20 confusable pairs (corpus #19,861) as a noun. The look-alike neighbours are the real trap.
- #19,861
- frequency rank, English
- 2,140
- “I” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of inverse document frequency.
Corpus desk
Index EN-idf · IDF · English
IDF · rank #19,861 · 0 variants · 20 confusables
- FREQ-MID #19,861
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 2,140
- PHOTO-FINISH husky
Nearest frequency peer: husky (-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.
Frequency neighbours of confusable “IDF”
Peers at similar corpus weight, separate from look-alike pairs below
- hijacked
hijacked
80,143 corpus weight
- housekeeper
housekeeper
80,142 corpus weight
- husky
husky
80,141 corpus weight
- IDF
IDF
80,140 corpus weight
- iggy
iggy
80,139 corpus weight
- imitate
imitate
80,138 corpus weight
What this shows Bars place “IDF” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
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 | IDF |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #19,861 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “IDF”
Easy to mix with look-alikes
The spelling risk for IDF is neighbouring look-alikes ("in", "is", …), not just typos; it is anoun. Frequency #19,861 among 2,140 “I” headwords. Gloss: "Initialism of inverse document frequency.".
IDF has no tracked misspelling variants, since its letter pattern doesn't lend itself to common typo substitutions. It also participates in 20 confusable-pair relationships, "in", "is", "it", and more, where similar look or sound leads writers to substitute one word for another in context.
This entry's etymology isn't recorded, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is IDF, spelled I-D-F.
Definition
- 1Initialism of inverse document frequency.
Recorded use
Wiktionary examplesThese source excerpts show how IDF appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
A finer point to observe is that the sample implementation provided in Example 7-4 adjusts the IDF score by adding a value of 1.0 to the logarithm calculation, for the purposes of illustration and because we're dealing with a trivial document set.
The idea behind inverse document frequency (IDF) is that all words in the corpus are not equally important.
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 "IDF"?
What does "IDF" mean?
What words are commonly confused with "IDF"?
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "IDF", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).