TCAS
/ˈtiːˌkæs/
"tcas" is a 4-letter English headword indexed on PlainSpell.
The verdict
“TCAS” is uncommon English (frequency #76,385 among 3,151 “T” headwords), classed as a noun. The kind of spelling people second-guess.
- #76,385
- frequency rank, English
- 3,151
- “T” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of traffic (alert and) collision avoidance system, a system for warning pilots of impending mid-air collisions and telling them what (if any) evasive action to take.
Corpus desk
Index EN-tcas · TCAS · English
TCAS · rank #76,385 · 0 variants · 0 confusables
- FREQ-RARE #76,385
- LEN-MID 4 letters
- VOW-1 1 vowel
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 3,151
- PHOTO-FINISH tatty
Nearest frequency peer: tatty (-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 “TCAS”
Sparse band: bars invert rank so rarer forms read shorter
- Tabriz
Tabriz
23,622 corpus weight
- tatty
tatty
23,617 corpus weight
- TCAS
TCAS
23,616 corpus weight
- teamster
teamster
23,615 corpus weight
- technicals
technicals
23,614 corpus weight
- Tejada
Tejada
23,613 corpus weight
What this shows Long-tail view: where “TCAS” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | TCAS |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈtiːˌkæs/ |
| Letters | 4 |
| Frequency rank | #76,385 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “TCAS” in English
Rare enough to double-check
TCAS is uncommon English at frequency #76,385 among 3,151 “T” headwords, classed as anoun, transcribed /ˈtiːˌkæs/. Rarity is why readers land here mid-draft. Gloss: "Initialism of traffic (alert and) collision avoidance system, a system for warning pilots of impending mid-air collisions and telling them what (if any) evasive action to take.".
Our edit-distance generator produced no likely misspellings for TCAS, since its letter sequence doesn't invite the usual edit-distance slips. It is not paired with a close-neighbour confusable in our dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Wiktionary doesn't record an etymology for this headword, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is TCAS, spelled T-C-A-S.
Definition
- 1Initialism of traffic (alert and) collision avoidance system, a system for warning pilots of impending mid-air collisions and telling them what (if any) evasive action to take.
Synonyms
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 "TCAS", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 4 letters (nearest by frequency rank).