NSF
"nsf" is a 3-letter English headword indexed on PlainSpell.
The verdict
“NSF” sits in 20 confusable pairs (corpus #27,233) as a proper noun. The look-alike neighbours are the real trap.
- #27,233
- frequency rank, English
- 1,534
- “N” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of National Science Foundation.
Corpus desk
Index EN-nsf · NSF · English
NSF · rank #27,233 · 0 variants · 20 confusables
- FREQ-MID #27,233
- LEN-MID 3 letters
- VOW-0 0 vowels
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 1,534
- PHOTO-FINISH observant
Nearest frequency peer: observant (+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 “NSF”
Peers at similar corpus weight, separate from look-alike pairs below
- narcissism
narcissism
72,772 corpus weight
- Navarro
Navarro
72,771 corpus weight
- NSF
NSF
72,768 corpus weight
- observant
observant
72,767 corpus weight
- ostrich
ostrich
72,765 corpus weight
- overcast
overcast
72,764 corpus weight
What this shows Bars place “NSF” 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 | NSF |
| Language | English |
| Part of speech | Proper noun |
| Letters | 3 |
| Frequency rank | #27,233 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “NSF”
Easy to mix with look-alikes
The spelling risk for NSF is neighbouring look-alikes ("NZ", "NT", …), not just typos; it is aproper noun. Frequency #27,233 among 1,534 “N” headwords. Gloss: "Initialism of National Science Foundation.".
NSF has no tracked misspelling variants, a sign its spelling follows regular English conventions. It also participates in 20 confusable-pair relationships, "NZ", "NT", "nu", 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 any spelling logic here comes from how the word's sounds map to letters, not a documented origin story. The correct English form is NSF, spelled N-S-F.
Definition
- 1Initialism of National Science Foundation.
Recorded use
Wiktionary exampleThese source excerpts show how NSF appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Those overall numbers are in line with Schumer's year-old plan to make NSF the spearpoint of a massive federal investment in research aimed at outinnovating China.
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 "NSF", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).