RSV
"rsv" is a 3-letter English headword indexed on PlainSpell.
The verdict
“RSV” is uncommon English (frequency #51,374 among 3,094 “R” headwords), classed as a noun. The kind of spelling people second-guess.
- #51,374
- frequency rank, English
- 3,094
- “R” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of respiratory syncytial virus.
Corpus desk
Index EN-rsv · RSV · English
RSV · rank #51,374 · 0 variants · 0 confusables
- FREQ-RARE #51,374
- LEN-MID 3 letters
- VOW-0 0 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 3,094
- PHOTO-FINISH rosin
Nearest frequency peer: rosin (-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 “RSV”
Sparse band: bars invert rank so rarer forms read shorter
- Risa
Risa
48,634 corpus weight
- ritalin
ritalin
48,633 corpus weight
- Robeson
Robeson
48,631 corpus weight
- rosin
rosin
48,628 corpus weight
- RSV
RSV
48,627 corpus weight
- rubella
rubella
48,626 corpus weight
What this shows Long-tail view: where “RSV” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | RSV |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #51,374 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “RSV” in English
Rare enough to double-check
RSV is uncommon English at frequency #51,374 among 3,094 “R” headwords, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.
No misspelling variants are generated for RSV in our index, which points to an orthography that plays by predictable English rules. We don't track a confusable pairing for this entry, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Wiktionary doesn't record an etymology for this headword, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is RSV, spelled R-S-V.
Definition
- 1Initialism of respiratory syncytial virus.
- 2Initialism of research survey vessel.
Recorded use
Wiktionary examplesThese source excerpts show how RSV appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
While most children will get RSV by age 2, getting sick is never ideal and for young children, or those at high risk for severe RSV disease.
The spokesperson said other science climate science projects would be restored, with four extra scientists approved to travel south on the icebreaking research vessel RSV Nuyina.
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 "RSV", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).