FIS
"fis" is a 3-letter English headword indexed on PlainSpell.
The verdict
“FIS” sits in 20 confusable pairs (corpus #40,245) as a noun. The look-alike neighbours are the real trap.
- #40,245
- frequency rank, English
- 2,507
- “F” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of flight information service.
Corpus desk
Index EN-fis · FIS · English
FIS · rank #40,245 · 0 variants · 20 confusables
- FREQ-MID #40,245
- LEN-MID 3 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 2,507
- PHOTO-FINISH fireside
Nearest frequency peer: fireside (-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 “FIS”
Peers at similar corpus weight, separate from look-alike pairs below
- fifi
fifi
59,760 corpus weight
- fingernail
fingernail
59,758 corpus weight
- fireside
fireside
59,757 corpus weight
- FIS
FIS
59,756 corpus weight
- fishman
fishman
59,755 corpus weight
- fisted
fisted
59,753 corpus weight
What this shows Bars place “FIS” 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 | FIS |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #40,245 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “FIS”
Easy to mix with look-alikes
The spelling risk for FIS is neighbouring look-alikes ("FL", "FM", …), not just typos; it is anoun. Frequency #40,245 among 2,507 “F” headwords. 2 recorded senses keep meaning in play.
No misspelling variants are generated for FIS in our index, since its letter pattern doesn't lend itself to common typo substitutions. It also participates in 20 confusable-pair relationships, "FL", "FM", "fu", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: Abbreviations. The correct English form is FIS, spelled F-I-S.
Definition
- 1Initialism of flight information service.
- 2Initialism of foal immunodeficiency syndrome
Etymology
Abbreviations.
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 "FIS"?
What does "FIS" mean?
What words are commonly confused with "FIS"?
What is the origin of the word "FIS"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "FIS", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).