MSR
"msr" is a 3-letter English headword indexed on PlainSpell.
The verdict
“MSR” is an uncommon English word, ranked #58,217 in English word frequency and used as a noun.
- #58,217
- frequency rank, English
- 3
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of molten salt reactor.
| Property | Value |
|---|---|
| Headword | MSR |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #58,217 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “MSR” sits in English frequency
Spelling & Dictionary Insight
The English entry for MSR is 3 letters long, classified as a noun. Corpus data places it at rank #58,217 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.
Zero misspellings are on record for MSR in our index, suggesting the orthography follows predictable English patterns. Our confusable-pair dataset has no match for it, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
No documented word history exists for this headword, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct English form is MSR, spelled M-S-R.
Definition
- 1Initialism of molten salt reactor.
- 2Initialism of Mars Sample Return mission.
- 3Mulder/Scully romance; a fanfic involving a romantic relationship between the characters Fox Mulder and Dana Scully of the The X-Files.
- 4Such fan fiction collectively.
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 “MSR”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is M-S-R - every other letter order is a misspelling in standard orthography.
- 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.